PYTHON-5808 Drop support for MongoDB 4.2#2892
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Bump minimum supported server version to MongoDB 4.4 (wire version 9). Remove dead code paths that only applied to wire version < 8 servers, including the legacy OP_GET_MORE protocol, the use_command dispatch mechanism, and the from_command response field.
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Update post-42-*.json SDAM error fixtures and test_wire_version to use wire version 9 (MongoDB 4.4), which is now the minimum supported version.
This reverts commit b2b6c5b.
Skip SDAM error spec tests whose mock servers report wire versions below the new minimum (9 / MongoDB 4.4), and update the test_wire_version assertion to use MIN_SUPPORTED_WIRE_VERSION.
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PYTHON-5808
Changes in this PR
Drops MongoDB 4.2 support, making MongoDB 4.4 (wire version 9) the new minimum. Removes dead code paths that only applied to pre-4.2 servers.
Test Plan
Standard test suite.
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