ci: align the whole symfony stack on the 8.1 edge job (#8465)

Author: soyuka

.github/workflows/ci.yml

@@ -909,8 +909,11 @@ jobs:
         run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
       - name: Allow unstable project dependencies
         run: composer config minimum-stability dev
-      - name: Force Symfony 8.1 dev for framework-bundle and json-streamer
-        run: composer require --dev --no-update --no-interaction "symfony/framework-bundle:8.1.x-dev" "symfony/json-streamer:8.1.x-dev"
+      # minimum-stability dev lets unpinned components float to the next minor's dev branch, and
+      # mixing Symfony minor dev branches is not supported: framework-bundle 8.1.x-dev with
+      # property-info/serializer/type-info 8.2.x-dev loses property metadata entirely
+      - name: Force Symfony 8.1 dev
+        run: composer require --dev --no-update --no-interaction "symfony/framework-bundle:8.1.x-dev" "symfony/json-streamer:8.1.x-dev" "symfony/serializer:8.1.x-dev" "symfony/property-info:8.1.x-dev" "symfony/type-info:8.1.x-dev"
       - name: Cache dependencies
         uses: actions/cache@caa296126883cff596d87d8935842f9db880ef25 # v5.1.0
         with: