Remove fail-fast to get tests on 8.2 even if 8.1 fails

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

Author: come-nc

.github/workflows/phpunit-mysql.yml

@@ -17,6 +17,8 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
+      # do not stop on another job's failure
+      fail-fast: false
       matrix:
         php-versions: ['8.1', '8.2']