ci: use Cysharp/Actions checkout instead of 3rd party directly

Author: guitarrapc

.github/workflows/build-debug.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: Cysharp/Actions/.github/actions/checkout@main
       - uses: Cysharp/Actions/.github/actions/setup-dotnet@main
       - run: dotnet build -c Debug
       - run: dotnet test tests/ZString.Tests -c Debug
@@ -37,7 +37,7 @@ jobs:
           UNITY_PASSWORD: "op://${{ vars.OP_VAULT_ACTIONS_PUBLIC }}/UNITY_LICENSE/credential"
           UNITY_SERIAL: "op://${{ vars.OP_VAULT_ACTIONS_PUBLIC }}/UNITY_LICENSE/serial"
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: Cysharp/Actions/.github/actions/checkout@main
       # Execute scripts: Export Package
       # /opt/Unity/Editor/Unity -quit -batchmode -nographics -silent-crashes -logFile -projectPath . -executeMethod PackageExporter.Export
       - name: Build Unity (.unitypacakge)

.github/workflows/build-release.yml

@@ -26,7 +26,7 @@ jobs:
     timeout-minutes: 10
     steps:
       - run: echo ${{ needs.update-packagejson.outputs.sha }}
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: Cysharp/Actions/.github/actions/checkout@main
         with:
           ref: ${{ needs.update-packagejson.outputs.sha }}
       - uses: Cysharp/Actions/.github/actions/setup-dotnet@main
@@ -60,7 +60,7 @@ jobs:
           UNITY_PASSWORD: "op://${{ vars.OP_VAULT_ACTIONS_PUBLIC }}/UNITY_LICENSE/credential"
           UNITY_SERIAL: "op://${{ vars.OP_VAULT_ACTIONS_PUBLIC }}/UNITY_LICENSE/serial"
 
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+      - uses: Cysharp/Actions/.github/actions/checkout@main
         with:
           ref: ${{ needs.update-packagejson.outputs.sha }}
       # Execute scripts: Export Package

.github/workflows/toc.yml

@@ -8,8 +8,7 @@ on:
 jobs:
   generateTOC:
     name: TOC Generator
-    runs-on: ubuntu-latest
-    steps:
-      - uses: technote-space/toc-generator@9e238e7974de5fcf7b17b7acc54c896160dda0a3 # v4.3.1
-        with:
-          TOC_TITLE: "## Table of Contents"
+    uses: Cysharp/Actions/.github/workflows/toc-generator.yaml@main
+    with:
+      TOC_TITLE: "## Table of Contents"
+    secrets: inherit