Downgrade Infection version to 0.27.11

Infection >= 0.28 doesn't work if php-parser 4 is installed.

Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>

Author: MauricioFauth

.github/workflows/mutation-tests.yml

@@ -36,7 +36,7 @@ jobs:
           php-version: ${{ matrix.php-version }}
           coverage: pcov
           ini-values: memory_limit=-1
-          tools: composer:v2, infection
+          tools: composer:v2, infection:0.27.11
 
       - name: Get Composer cache directory
         id: composer-cache