chore: bump actions/checkout from 2.3.4 to 4.1.1 (#50)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.4 to 4.1.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2.3.4...v4.1.1)

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

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

.github/workflows/build-and-test.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout this repository
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.1.1
         with:
           path: musen
 

.github/workflows/deploy-documentation.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout this repository
-        uses: actions/checkout@v2.3.4
+        uses: actions/checkout@v4.1.1
         with:
           path: musen