chore(deps): bump actions/checkout from 6 to 7 (#888)

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
           - app: apps/unicorn-store-spring
     name: Build ${{ matrix.app }}
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
@@ -63,7 +63,7 @@ jobs:
       AWS_REGION: 'us-east-1'
       SRC: apps/java-spring-ai-agents/backoffice
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
@@ -114,7 +114,7 @@ jobs:
             skipTests: true
     name: Build ${{ matrix.sample }}
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
@@ -132,7 +132,7 @@ jobs:
     env:
       AWS_REGION: 'us-east-1'
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up JDK 25
       uses: actions/setup-java@v5
       with:
@@ -156,7 +156,7 @@ jobs:
       run:
         working-directory: ./infra/scripts/setup/thread-dump-lambda/
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - name: Set up Python
       uses: actions/setup-python@v6
       with: