adds nvmrc file with recommended nvm version #34016

Job	Run time
build	3m 1s
test-test-account-api	1m 15s
test-playwright-e2e-shard-2-of-2	6m 39s
test-playwright-e2e-shard-1-of-2	5m 25s
test-upgrade-downgrade	2m 12s
test-upgrade-stable	1m 39s
aggregator_test	6m 31s
Upload assets	15s
Same wasms for mainnet and local	10s
test-rest	3m 37s
build-pass	6s
	30m 50s

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