Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/release.yml

@@ -36,7 +36,7 @@ jobs:
       NUGET_PACKAGES: ${{ github.workspace }}/.github/nuget-packages
     steps:
       - name: 📝 Fetch Sources 📝
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 💡 Perform Common Steps 💡
         uses: ./.github/workflows/perform-common-steps

.github/workflows/run-build-and-unit-tests.yml

@@ -35,7 +35,7 @@ jobs:
       NUGET_PACKAGES: ${{ github.workspace }}/.github/nuget-packages
     steps:
       - name: 📝 Fetch Sources 📝
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 💡 Perform Common Steps 💡
         uses: ./.github/workflows/perform-common-steps
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 📝 Fetch Sources 📝
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: ✅ Verify encoding ✅
         shell: pwsh
         run: scripts/Test-Encoding.ps1
@@ -61,6 +61,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 📝 Fetch Sources 📝
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: ✅ REUSE license check ✅
         uses: fsfe/reuse-action@v6