Bump GH actions, cleanups (#15)

.github/workflows/crosscheck.yml

@@ -4,10 +4,10 @@ on:
     - cron:  '45 4 * * *'
 
 jobs:
-  ss58:
+  crosscheck:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: check
       env:
         CI_LOG: 123

.github/workflows/pr-any.yml

@@ -9,7 +9,7 @@ jobs:
     name: ${{ matrix.step }}
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: ${{ matrix.step }}
       env:
         CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}

.github/workflows/push-master.yml

@@ -13,7 +13,7 @@ jobs:
     if: "! startsWith(github.event.head_commit.message, '[CI Skip]') && github.repository == 'polkadot-js/phishing'"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         token: ${{ secrets.GH_PAT }}
     - name: ${{ matrix.step }}