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

.github/workflows/deploy-firebase.yml

@@ -41,7 +41,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/setup-node@v6

.github/workflows/firebase-deploy.yml

@@ -38,7 +38,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version-file: .tool-versions

.github/workflows/fireway-migrate.yml

@@ -42,7 +42,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version-file: .tool-versions

.github/workflows/pnpm-deploy-firebase.yml

@@ -45,7 +45,7 @@ jobs:
       group: deploy-firebase-${{ inputs.firebase-environment }}-${{ inputs.github-environment }}
       cancel-in-progress: true
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: setup pnpm

.github/workflows/pnpm-fireway-migrate.yml

@@ -42,7 +42,7 @@ jobs:
     concurrency:
       group: fireway-migrate-${{ inputs.gcp-project-id }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: setup pnpm
         uses: valian-ca/github-workflows/.github/actions/setup-pnpm@main
       - uses: valian-ca/github-workflows/.github/actions/gcp-github-auth@main

.github/workflows/pr-markdownlint.yml

@@ -7,7 +7,7 @@ jobs:
     name: markdown lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: DavidAnson/markdownlint-cli2-action@v21
         with:
           globs: '**/*.md'