Update pallet-nis to support Block Number Provider #20404

Job	Run time
check-dependency-rules	9s
check-fail-ci	11s
check-markdown	15s
check-readme	3m 53s
check-workspace	21s
preflight / preflight	45s
preflight / ci-versions	1m 9s
check-rust-feature-propagation	2m 2s
check-toml-format	1m 3s
check-umbrella	2m 7s
fmt	1m 7s
test-rust-features	1m 56s
All quick checks passed	1s
	14m 59s

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