ci: test in main branch with MongoDB 8.0

Author: QuadStingray

.github/workflows/main_test_release.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        mongodb-version: ['4.4', '5.0', '6.0', '7.0']
+        mongodb-version: [ '4.4', '5.0', '6.0', '7.0' , '8.0' ]
         java: [ '21', '23' ]
     steps:
       - uses: actions/checkout@main