Fix release version to 2.3.0 in rpc changelog #7056

Job	Run time
Protobuf Backward Compatibility	13s
Cargo Nextest (Linux)	15m 45s
Cargo Nextest (Linux Nightly)	15m 26s
Protocol Schema	13m 57s
Backward Compatibility	11m 42s
Cargo Nextest (MacOS)	11m 47s
Database Migration	11m 47s
Genesis Changes	9m 42s
Sanity Checks	5m 45s
Style	37s
Upgradability	11m 54s
Cargo Audit	23s
Cargo Deny	32s
Cargo Clippy	8m 25s
Cargo Fmt	22s
Non-default Configuration Builds	1m 16s
Themis	41s
Unused Dependencies	6m 40s
Rust Doctests	10m 59s
Lychee Lints	1m 1s
Windows check for building public libraries	4m 34s
Upload Coverage	25s
Generate Coverage Artifact (unit, unit)	2m 10s
Generate Coverage Artifact (integration, unit integration)	3m 23s
	2h 29m 26s

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