Bump the known_good_semver group with 2 updates (#1485)

Bumps the known_good_semver group with 2 updates: [serde_json](https://github.com/serde-rs/json) and [syn](https://github.com/dtolnay/syn).


Updates `serde_json` from 1.0.105 to 1.0.106
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.105...v1.0.106)

Updates `syn` from 2.0.31 to 2.0.32
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/2.0.31...2.0.32)

---
updated-dependencies:
- dependency-name: serde_json
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: known_good_semver
- dependency-name: syn
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: known_good_semver
...

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

substrate/client/consensus/babe/rpc/Cargo.toml

@@ -30,7 +30,7 @@ sp-keystore = { path = "../../../../primitives/keystore" }
 sp-runtime = { path = "../../../../primitives/runtime" }
 
 [dev-dependencies]
-serde_json = "1.0.85"
+serde_json = "1.0.106"
 tokio = "1.22.0"
 sc-consensus = { path = "../../common" }
 sc-keystore = { path = "../../../keystore" }

substrate/client/consensus/beefy/rpc/Cargo.toml

@@ -23,7 +23,7 @@ sp-core = { path = "../../../../primitives/core" }
 sp-runtime = { path = "../../../../primitives/runtime" }
 
 [dev-dependencies]
-serde_json = "1.0.85"
+serde_json = "1.0.106"
 sc-rpc = { path = "../../../rpc", features = ["test-helpers"]}
 substrate-test-runtime-client = { path = "../../../../test-utils/runtime/client" }
 tokio = { version = "1.22.0", features = ["macros"] }

substrate/client/consensus/grandpa/Cargo.toml

@@ -25,7 +25,7 @@ log = "0.4.17"
 parity-scale-codec = { version = "3.6.1", features = ["derive"] }
 parking_lot = "0.12.1"
 rand = "0.8.5"
-serde_json = "1.0.85"
+serde_json = "1.0.106"
 thiserror = "1.0"
 fork-tree = { path = "../../../utils/fork-tree" }
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", path = "../../../utils/prometheus" }