[CI] Remove duplicated matrix entry for Symfony version in unit-tests.yaml

Author: Kocal

.github/workflows/unit-tests.yaml

@@ -47,8 +47,6 @@ jobs:
                         symfony-version: '6.4.*'
                         os: 'windows-latest'
                     # Explicit Symfony versions
-                    -  php-version: '8.1'
-                       symfony-version: '6.4.*'
                     -  php-version: '8.2'
                        symfony-version: '7.4.x-dev' # TODO: change to '7.4' when Symfony 7.4 is released
                     -  php-version: '8.5'