Downgrade plv8 for Postgres 14/15 (#5320) #12668

Job	Run time
check-permissions	1s
check-codestyle-python	2m 58s
check-codestyle-rust	7m 58s
tag	12s
build-neon (debug)	7m 26s
build-neon (release)	6m 56s
compute-node-image (v14)	18m 7s
compute-node-image (v15)	16m 45s
neon-image	10m 37s
trigger-custom-extensions-build-and-wait	3m 50s
compute-tools-image	4m 2s
compute-node-image (v16)	15m 21s
regress-tests (debug, v14)	13m 32s
benchmarks (1, release)	21m 3s
regress-tests (debug, v15)	11m 11s
benchmarks (2, release)	18m 59s
benchmarks (3, release)	36m 22s
regress-tests (debug, v16)	11m 41s
benchmarks (4, release)	8m 28s
regress-tests (release, v14)	8m 31s
regress-tests (release, v15)	14m 36s
regress-tests (release, v16)	13m 1s
test-images	2m 59s
vm-compute-node-image (v14)	3m 12s
vm-compute-node-image (v15)	1m 32s
vm-compute-node-image (v16)	3m 17s
promote-images	3m 6s
coverage-report (debug)	5m 0s
trigger-e2e-tests	8s
deploy	1m 39s
promote-compatibility-data	0s
create-test-report	7m 28s
	4h 39m 58s

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