Bump actions/checkout from 2 to 4

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>

.github/workflows/clang-format.yml

@@ -8,7 +8,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '🎨')"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: DoozyX/clang-format-lint-action@v0.10
       name: "Run clang-format"
       with:
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: "Install js-beautify"
       run: sudo npm -g install js-beautify
     - name: "🎨 Run js-beautify"

.github/workflows/linux-appimage.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     -
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         lfs: true
     -

.github/workflows/remove-old-artifacts.yml

@@ -11,7 +11,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Remove old artifacts
       uses: c-hive/gha-remove-artifacts@v1
       with: