Resume backward compatibility check

Use the fork rebased on the latest Roave BackwardCompatibilityCheck, which
needs PHP 8.4. Dev dependencies are installed so that PHPStan\Testing classes
can be reflected, and findings are reported as GitHub annotations.

Amp-Thread-ID: https://ampcode.com/threads/T-01a18e4e-ef3d-77b9-85d1-deac9a4a2e18

Author: ondrejmirtes

.github/workflows/backward-compatibility.yml

@@ -40,15 +40,15 @@ jobs:
         uses: "shivammathur/setup-php@eb7c497e18156a6bbabfef1d3a82760b9eda3962" # 2.40.0
         with:
           coverage: "none"
-          php-version: "8.2"
+          php-version: "8.4"
 
       - uses: "ramsey/composer-install@65e4f84970763564f46a70b8a54b90d033b3bdda" # v4.0.0
 
       - name: "Install BackwardCompatibilityCheck"
         run: |
           composer global config minimum-stability dev
           composer global config prefer-stable true
-          composer global require --dev ondrejmirtes/backward-compatibility-check:^7.3.0.1
+          composer global require --dev ondrejmirtes/backward-compatibility-check:^8.27.0.2
 
       - name: "Check"
-        run: '"$(composer global config bin-dir --absolute)"/roave-backward-compatibility-check'
+        run: '"$(composer global config bin-dir --absolute)"/roave-backward-compatibility-check --install-development-dependencies --format=console --format=github-actions'