Bump actions/checkout from 5 to 6 (#671)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/analyze_and_test.yml

@@ -8,7 +8,7 @@ jobs:
   static_analysis_and_test:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: kuhnroyal/flutter-fvm-config-action/setup@v3
 

.github/workflows/build_app.yml

@@ -9,7 +9,7 @@ jobs:
   android_build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Java 21
       uses: actions/setup-java@v5
@@ -52,7 +52,7 @@ jobs:
   ios_build:
     runs-on: macos-15
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: kuhnroyal/flutter-fvm-config-action/setup@v3
 

.github/workflows/integration_tests.yml

@@ -11,7 +11,7 @@ jobs:
     name: Run integration tests
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up Java 21
       uses: actions/setup-java@v5

.github/workflows/sync_tags_localise.yml

@@ -10,7 +10,7 @@ jobs:
 
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Delete tag in localise if exist.
               uses: fjogeleit/http-request-action@v1

.github/workflows/update_locales.yml

@@ -21,7 +21,7 @@ jobs:
 
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - uses: actions/setup-python@v6
               with: