build(deps): bump actions/checkout from 5 to 6 (#2128)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-nodes.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: parity-large
     steps:
       - name: checkout polkadot-sdk
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: paritytech/polkadot-sdk
 

.github/workflows/nightly.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes

.github/workflows/rust.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Rust nightly toolchain
         uses: actions-rs/toolchain@v1
@@ -59,7 +59,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -91,7 +91,7 @@ jobs:
     needs: [fmt, machete]
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -123,7 +123,7 @@ jobs:
     needs: [fmt, machete]
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -155,7 +155,7 @@ jobs:
     needs: [fmt, machete]
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -222,7 +222,7 @@ jobs:
     needs: [check]
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -273,7 +273,7 @@ jobs:
     needs: [fmt, machete]
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Rust stable toolchain
         uses: actions-rs/toolchain@v1
@@ -306,7 +306,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -340,7 +340,7 @@ jobs:
     timeout-minutes: 45
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -380,7 +380,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -414,7 +414,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes
@@ -448,7 +448,7 @@ jobs:
       WASM_BINDGEN_TEST_TIMEOUT: 300
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install wasm-pack
         run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
@@ -501,7 +501,7 @@ jobs:
     timeout-minutes: 30
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Note: needs nighly toolchain because otherwise we cannot define custom lang-items.
       - name: Install Rust nightly toolchain

.github/workflows/update-artifacts.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       # We run this (up-to-date) node locally to fetch metadata from it for the artifacts
       - name: Use substrate and polkadot node binaries
         uses: ./.github/workflows/actions/use-nodes

.github/workflows/validate-dependabot.yml

@@ -9,6 +9,6 @@ jobs:
   validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: marocchino/validate-dependabot@v3
         id: validate