Bump actions/checkout from 3 to 4 (#32)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  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/minimal-versions.yml

@@ -26,7 +26,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
         shell: bash
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: RustCrypto/actions/cargo-cache@master
       - name: Install zlint
         if: inputs.install-zlint

.github/workflows/set-msrv.yml

@@ -20,6 +20,6 @@ jobs:
     outputs:
       msrv: ${{ steps.msrv.outputs.msrv }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - id: msrv
         run: echo "msrv=$(echo ${{ inputs.msrv }})" >> $GITHUB_OUTPUT

.github/workflows/workspace.yml

@@ -14,5 +14,5 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: yamllint --no-warnings .