Merge pull request 'Update actions/checkout action to v6' (#2) from renovate/actions-checkout-6.x into main

Reviewed-on: #2

.gitea/workflows/build-java.yml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         java_version: [21]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
     - name: Login to Registry
       uses: docker/login-action@v3

.gitea/workflows/build-php.yml

@@ -13,7 +13,7 @@ jobs:
       matrix:
         php_version: [82, 84]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
     - name: Login to Registry
       uses: docker/login-action@v3

.gitea/workflows/build-python.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
     - name: Login to Registry
       uses: docker/login-action@v3