Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🛎️ Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 🐍 Set up Python
         uses: actions/setup-python@v6
@@ -43,7 +43,7 @@ jobs:
         working-directory: gcp
     steps:
       - name: 🛎️ Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 🏗️ Setup Terraform
         uses: hashicorp/setup-terraform@v4
@@ -75,7 +75,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🛎️ Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 🔍 ShellCheck
         run: |
@@ -87,7 +87,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 🛎️ Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: 🏗️ Build Docker image
         run: |