Update actions/checkout action from vv4 to v6

Author: renovate[bot]

.github/workflows/build_and_deploy.yml

@@ -9,7 +9,7 @@ name: Build and deploy
 jobs:
   build:
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Cache node modules
         id: cache-npm
         uses: actions/cache@v4
@@ -59,7 +59,7 @@ jobs:
     needs: [build]
     environment: 'dev'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download all workflow run artifacts
         uses: actions/download-artifact@v4
       - uses: FirebaseExtended/action-hosting-deploy@v0
@@ -73,7 +73,7 @@ jobs:
     needs: [deploy_dev]
     environment: 'staging'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download all workflow run artifacts
         uses: actions/download-artifact@v4
       - uses: FirebaseExtended/action-hosting-deploy@v0
@@ -87,7 +87,7 @@ jobs:
     needs: [deploy_dev, deploy_staging]
     environment: 'prod'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Download all workflow run artifacts
         uses: actions/download-artifact@v4
       - uses: FirebaseExtended/action-hosting-deploy@v0

.github/workflows/pull_request_build_and_deploy.yml

@@ -8,7 +8,7 @@ jobs:
     if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Cache node modules
         id: cache-npm
         uses: actions/cache@v4