Attempt fixing mutation tests

Author: gmazzap

.github/workflows/mutation-tests.yml

@@ -25,10 +25,10 @@ jobs:
     mutation-tests:
         runs-on: ubuntu-latest
         steps:
-            -   uses: actions/checkout@v4
+            -   uses: actions/checkout@v7
             -   uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.3'
+                    php-version: '8.5'
                     tools: infection
             -   uses: ramsey/composer-install@v3
-            -   run: infection --min-covered-msi=95 --no-progress --log-verbosity=none --threads=max
+            -   run: infection --min-covered-msi=95 --no-progress --log-verbosity=none --threads=max