Bump actions/checkout from 2 to 4 (#67)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...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/CI.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Restore
         run: tools/restore.ps1
@@ -30,7 +30,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Restore
         run: tools/restore.ps1

.github/workflows/detailed-tests.yml

@@ -21,7 +21,7 @@ jobs:
         - {pwsh: 6.0.4, ubuntu: 16.04}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Build the Docker image
       run: |
         export VERSION=${{ matrix.versions.pwsh }}

.github/workflows/powershell.yml

@@ -19,7 +19,7 @@ jobs:
     name: PSScriptAnalyzer
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Run PSScriptAnalyzer
         uses: microsoft/psscriptanalyzer-action@2044ae068e37d0161fa2127de04c19633882f061