chore(main): release 2.22.0 (#2602)

* chore(main): release 2.22.0

* update cloud-sql-proxy.md for the version as well

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Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Jin Hou <jinphou@google.com>