Bump actions/checkout from 3.6.0 to 4.1.2

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.1.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.6.0...9bb5618)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/integration-tests.yml

@@ -1002,7 +1002,7 @@ jobs:
       - name: Checkout the solana repo
         # Use v3.6.0 because the custom runner (container configured above)
         # doesn't have node20 installed which is required for versions >=4
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+        uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
         with:
           repository: smartcontractkit/chainlink-solana
           ref: ${{ needs.get_solana_sha.outputs.sha }}