Remove incompatible packages

Author: GromNaN

.github/workflows/continuous-integration.yml

@@ -91,7 +91,7 @@ jobs:
             mongodb-version: "8.0"
             driver-version: "stable"
             dependencies: "highest"
-            symfony-version: "^8.0"
+            symfony-version: "8.0"
             proxy: "lazy-ghost"
           # Test with a sharded cluster
           # Currently disabled due to a bug where MongoDB reports "sharding status unknown"
@@ -144,8 +144,11 @@ jobs:
         if: "${{ matrix.symfony-version != 'stable' }}"
         run: |
           composer config minimum-stability dev
+          # incompatible with Symfony 8.0
+          composer remove --no-update --dev doctrine/orm phpbench/phpbench
           # update symfony deps
           composer require --no-update symfony/console:^${{ matrix.symfony-version }}
+          composer require --no-update symfony/var-exporter:^${{ matrix.symfony-version }}
           composer require --no-update symfony/var-dumper:^${{ matrix.symfony-version }}
           composer require --no-update --dev symfony/cache:^${{ matrix.symfony-version }}