Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/android.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: set up JDK 17
       uses: actions/setup-java@v5
       with:

.github/workflows/deploy_alpha.yml

@@ -11,7 +11,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Create google-services.json

.github/workflows/deploy_beta.yml

@@ -11,7 +11,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Create google-services.json

.github/workflows/deploy_production.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/main'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Create google-services.json