disable coverals reporting on mac. It still doesn't work.

.github/workflows/ci.yml

@@ -306,6 +306,11 @@ jobs:
           python -m coverage report -i || true
       - name: Coveralls Parallel
         uses: coverallsapp/github-action@v2
+        # 20230707: On macOS, this installs coveralls from homebrew.
+        # It then runs ``coveralls report``. But that is producing
+        # a usage error from ``coveralls`` (report is not recognized) Presumably the
+        # brew and action versions are out of sync?
+        if: (startsWith(runner.os, 'Linux'))
         with:
           flag-name: run-${{ join(matrix.*, '-') }}
           parallel: true

src/gevent/testing/patched_tests_setup.py

@@ -558,6 +558,14 @@ if WIN:
     if sys.version_info[:2] <= (3, 9):
         disabled_tests += [
             'test_context.HamtTest.test_hamt_collision_3',
+            # Sometimes fails::
+            #
+            #     self.assertIn('got more than ', str(cm.exception))
+            # AssertionError: 'got more than ' not found in
+            #    'Remote end closed connection without response'
+            #
+            'test_httplib.BasicTest.test_overflowing_header_limit_after_100',
+
         ]
 
     # These are a problem on 3.5; on 3.6+ they wind up getting (accidentally) disabled.