Bump actions/checkout from 4 to 5 (#30)

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  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>

Author: dependabot[bot]

.github/workflows/action.yml

@@ -15,7 +15,7 @@ jobs:
           - ubuntu-latest
             #- macos-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - name: Cache choosenim
       id: cache-choosenim
       uses: actions/cache@v4
@@ -42,7 +42,7 @@ jobs:
         version:
           - stable
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: jiro4989/setup-nim-action@master
       with:
         nim-version: ${{ matrix.version }}