chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/publish.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: NuGet
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: actions/setup-dotnet@v3
         with:
           dotnet-version: 9.x
@@ -16,7 +16,7 @@ jobs:
   docker-push:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: actions/setup-dotnet@v3
         with:
           dotnet-version: 9.x

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
   format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: actions/setup-dotnet@v3
         with:
           dotnet-version: |
@@ -28,7 +28,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
       - uses: actions/setup-dotnet@v3
         with:
           dotnet-version: |