Bump actions/checkout from 3 to 4

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>

.github/workflows/codeql.yml

@@ -35,7 +35,7 @@ jobs:
       run: |
         sudo dnf -y install git-core gcc qt5-qtbase-devel qt5-qttools-devel
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v2
       with:

.github/workflows/flatpak.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
       - name: Fetch sources
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build flatpak
         uses: gasinvein/action-flatpak-build@master

.github/workflows/linux.yml

@@ -36,7 +36,7 @@ jobs:
       run: |
         sudo dnf -y install git-core
     - name: Fetching sources
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Installing compiler ${{ matrix.compiler }}
       run: |
         sudo dnf -y install '/usr/bin/${{ matrix.cc }}' '/usr/bin/${{ matrix.cxx }}'