gitea ci workflow - change validation steps composer install

.gitea/workflows/ci.yaml

@@ -102,8 +102,7 @@ jobs:
 
   validation:
     name: Coding Standard & Static Analysis
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
-
     steps:
       - uses: actions/checkout@v4
       - name: Setup PHP
@@ -123,6 +122,17 @@ jobs:
           path: ${{ steps.composercache.outputs.dir }}
           key: ${{ runner.os }}-composer-${{ steps.key-date.outputs.date }}-${{ hashFiles('composer.json') }}-${{ matrix.prefer-lowest }}
 
+      - name: Composer install
+        run: |
+          composer --version
+          if ${{ matrix.prefer-lowest == 'prefer-lowest' }}
+          then
+            composer update --prefer-lowest --prefer-stable
+            composer require --dev dereuromark/composer-prefer-lowest:dev-master
+          else
+            composer install --no-progress --prefer-dist --optimize-autoloader
+          fi
+
       - name: Composer phpstan setup
         run: composer stan-setup