Add information about 2.2.1 to CHANGELOG.md #7744

Job	Run time
Protobuf Backward Compatibility	11s
Backward Compatibility	11m 27s
Cargo Nextest (Linux)	15m 47s
Cargo Nextest (Linux Nightly)	25m 36s
Database Migration	11m 36s
Cargo Nextest (MacOS)	12m 4s
Cargo Deny	32s
Cargo Clippy	8m 52s
Cargo Fmt	21s
Themis	38s
Rust Doctests	11m 19s
Protocol Schema	14m 28s
Genesis Changes	9m 46s
Sanity Checks	6m 17s
Upgradability	11m 18s
Style	39s
Cargo Audit	23s
Non-default Configuration Builds	1m 18s
Unused Dependencies	7m 9s
Windows check for building public libraries	4m 38s
Generate Coverage Artifact (unit, unit)	2m 22s
Generate Coverage Artifact (integration, unit integration)	2m 40s
Upload Coverage	18s
	2h 39m 39s

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