v1.9.3

What's Changed

• [1.9] test stability improvement. by @methane in #1699
• [1.9] Transaction Commit/Rollback returns conn's cached error by @methane in #1702
• backport benchmark_test by @methane in #1706
• [1.9] optimize readPacket (#1705) by @methane in #1707
• [1.9] fix PING on compressed connections by @methane in #1723
• release v1.9.3 by @methane in #1725

Full Changelog: v1.9.2...v1.9.3