chore(deps): update actions/checkout action to v5 (#273)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/CI.yaml

@@ -12,7 +12,7 @@ jobs:
     name: Check format
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.0.x
@@ -29,7 +29,7 @@ jobs:
           - macos-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.0.x
@@ -39,7 +39,7 @@ jobs:
     needs: [test, check_format]
     runs-on: windows-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.0.x
@@ -67,7 +67,7 @@ jobs:
           - STUN
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: 9.0.x