[PR #8747/e97b17a6 backport][3.10] Make MESSAGE_TYPES_WITH_CONTENT a frozenset for the WebSocketReader #8750
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This is a backport of PR #8747 as merged into master (e97b17a).
followup #8736 (comment)
frozenset is a tiny bit faster than the tuple
0.013342750000447268 vs 0.018335040998863406