bump version to v2.3.0 #18621

Job	Run time
check (associated-token-account)	9m 25s
check (associated-token-account)	9m 25s
test_cli (single-pool)	26m 49s
test_cli (single-pool)	14m 29s
check (feature-proposal)	1m 54s
check (feature-proposal)	1m 54s
test_cli (token-2022)	18m 14s
test_cli (token-2022)	18m 14s
cargo-test-sbf (associated-token-account)	9m 25s
cargo-test-sbf (associated-token-account)	9m 25s
check (instruction-padding)	53s
check (instruction-padding)	53s
cargo-test-sbf (feature-proposal)	5m 31s
cargo-test-sbf (feature-proposal)	5m 31s
check (memo)	1m 21s
check (memo)	1m 21s
cargo-test-sbf (instruction-padding)	5m 57s
cargo-test-sbf (instruction-padding)	5m 57s
check (record)	1m 16s
check (record)	1m 16s
cargo-test-sbf (memo)	5m 51s
cargo-test-sbf (memo)	5m 51s
check (single-pool)	3m 52s
check (single-pool)	3m 52s
cargo-test-sbf (record)	7m 58s
cargo-test-sbf (record)	7m 58s
check (slashing)	1m 22s
check (slashing)	1m 22s
cargo-test-sbf (single-pool)	7m 45s
cargo-test-sbf (single-pool)	7m 45s
check (stake-pool)	5m 49s
check (stake-pool)	5m 49s
cargo-test-sbf (slashing)	11m 36s
cargo-test-sbf (slashing)	11m 36s
check (token-2022)	2m 20s
check (token-2022)	2m 20s
cargo-test-sbf (stake-pool)	10m 10s
cargo-test-sbf (stake-pool)	10m 10s
cargo-test-sbf (token-2022)	6m 35s
cargo-test-sbf (token-2022)	6m 35s
	4h 35m 46s

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