chore(deps): Bump actions/checkout from 3 to 4 (#7474)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/appengine_deploy.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       # Checks-out the repository under $GITHUB_WORKSPACE.
       # When running manually this checks out the master branch.
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Prepare demo files
         # Install all dependencies, then copy all the files needed for demos.

.github/workflows/browser_test.yml

@@ -24,7 +24,7 @@ jobs:
         # https://nodejs.org/en/about/releases/
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false
 

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
         # https://nodejs.org/en/about/releases/
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false
 
@@ -58,7 +58,7 @@ jobs:
     timeout-minutes: 5
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Use Node.js 20.x
         uses: actions/setup-node@v3
@@ -75,7 +75,7 @@ jobs:
     timeout-minutes: 5
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Use Node.js 20.x
         uses: actions/setup-node@v3