Remove beta tag from gossipsub 1.2 #18287

Job	Run time
check-code	9m 22s
Check for 'skip-ci' label	1s
check-msrv	5m 10s
target-branch-check	1s
release-tests-ubuntu	20m 36s
release-tests-windows	29m 23s
network-tests	12m 9s
beacon-chain-tests	16m 8s
op-pool-tests	15m 27s
slasher-tests	1m 28s
basic-simulator-ubuntu	13m 17s
cargo-udeps	7m 36s
cli-check	16m 43s
compile-with-beta-compiler	13m 22s
debug-tests-ubuntu	12m 36s
ef-tests-ubuntu	13m 36s
execution-engine-integration-ubuntu	11m 26s
fallback-simulator-ubuntu	11m 47s
state-transition-vectors-ubuntu	2m 26s
test-suite-success	6s
	3h 32m 40s

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