build(deps): bump actions/checkout from 3 to 4

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](actions/checkout@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>

.github/workflows/push.yml

@@ -33,7 +33,7 @@ jobs:
           pip install requests-kerberos
 
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install module
         run: pip install .[tests]
@@ -54,7 +54,7 @@ jobs:
 
     steps:
       - name: ⬇️ Set up code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: 🗝️ Authenticate to Google Cloud
         id: auth
@@ -124,7 +124,7 @@ jobs:
 
     steps:
       - name: ⬇️ Set up code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: 🗝️ Authenticate to Google Cloud
         id: auth