update workflow actions

Author: StephenHodgson

.github/workflows/integration-tests.yml

@@ -16,7 +16,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           sparse-checkout: .github/
       - uses: RageAgainstThePixel/job-builder@v1

.github/workflows/publish.yml

@@ -9,7 +9,7 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24.x

.github/workflows/unity-build.yml

@@ -26,12 +26,12 @@ jobs:
     steps:
       - name: Free Disk Space
         if: ${{ matrix.os == 'ubuntu-latest' && (matrix.unity-version != '2018' && matrix.unity-version != '2017.4.40f1') }}
-        uses: endersonmenezes/free-disk-space@713d134e243b926eba4a5cce0cf608bfd1efb89a # v2.1.1
+        uses: endersonmenezes/free-disk-space@e6ed9b02e683a3b55ed0252f1ee469ce3b39a885 # v3.1.0
         with:
           remove_android: true
           remove_dotnet: false
           remove_tool_cache: false
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: 24.x