tests: use coverage < 7.6.2 or > 7.6.8 with pypy 3.10

Bug: T380732
Change-Id: I7b16584fe796c8cd0db9891dfe121b64f4794be8

.github/workflows/pywikibot-ci.yml

@@ -89,6 +89,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip --version
+        # T380732
+        pip install "coverage !=7.6.2,!=7.6.3,!=7.6.4,!=7.6.5,!=7.6.6,!=7.6.7,!=7.6.8; implementation_name=='pypy' and python_version=='3.10'"
         if [ -f dev-requirements.txt ]; then pip install -r dev-requirements.txt; fi
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
         pip install wikitextparser