Fix CI for LTS

.github/workflows/continuous-integration.yml

@@ -32,6 +32,7 @@ jobs:
           - "7.3"
           - "7.4"
           - "8.0"
+          - "8.1"
         dependencies: [locked]
         os: [ubuntu-latest]
         experimental: [false]
@@ -44,10 +45,6 @@ jobs:
             dependencies: lowest
             os: ubuntu-latest
             experimental: false
-          - php-version: "8.0"
-            dependencies: highest
-            os: ubuntu-latest
-            experimental: false
           - php-version: "8.0"
             os: windows-latest
             dependencies: locked
@@ -57,13 +54,13 @@ jobs:
             dependencies: locked
             experimental: false
           - php-version: "8.1"
-            dependencies: lowest-ignore
+            dependencies: lowest
             os: ubuntu-latest
-            experimental: true
+            experimental: false
           - php-version: "8.1"
-            dependencies: highest-ignore
+            dependencies: highest
             os: ubuntu-latest
-            experimental: true
+            experimental: false
 
     steps:
       - name: "Checkout"
@@ -118,14 +115,11 @@ jobs:
         run: "echo \"SYMFONY_DEPRECATIONS_HELPER=baselineFile=./tests/deprecations-8.1.json&max[direct]=0\" >> $GITHUB_ENV"
 
       - name: "Update dev requirements to latest available for the current PHP even on locked builds as they are not bundled dependencies"
-        run: "composer update ${{ env.COMPOSER_FLAGS }} symfony/phpunit-bridge phpspec/prophecy phpdocumentor/* sebastian/* doctrine/instantiator"
+        run: "composer config platform --unset && composer update ${{ env.COMPOSER_FLAGS }} symfony/phpunit-bridge phpspec/prophecy phpdocumentor/* sebastian/* doctrine/instantiator"
 
       - name: "Run install again using composer binary from source"
         run: "bin/composer install ${{ env.COMPOSER_FLAGS }}"
 
-      - name: "Validate composer.json"
-        run: "bin/composer validate"
-
       - name: "Prepare git environment"
         run: "git config --global user.name composer && git config --global user.email composer@example.com"