Fix min relay fee to be 1s/vB #16530

Job	Run time
build-tx-sync (ubuntu-latest, stable)	4m 27s
build (ubuntu-latest, stable)	1h 1m 14s
build-tx-sync (ubuntu-latest, beta)	4m 18s
build (ubuntu-latest, beta)	58m 24s
benchmark	18m 38s
build-tx-sync (ubuntu-latest, 1.75.0)	4m 33s
build (ubuntu-latest, 1.63.0)	1h 18m 50s
check_commits	14m 47s
build-tx-sync (macos-latest, stable)	5m 25s
build (windows-latest, stable)	1h 46m 18s
build-tx-sync (macos-latest, beta)	4m 9s
check_release	2m 8s
build (windows-latest, beta)	1h 48m 10s
build-tx-sync (macos-latest, 1.75.0)	5m 2s
build (macos-latest, stable)	1h 2m 28s
coverage	7m 50s
build (macos-latest, beta)	59m 7s
fuzz	1h 27m 8s
build (macos-latest, 1.63.0)	1h 7m 51s
incremental-mutants	1h 31m 37s
linting	1m 6s
rustfmt	12s
	14h 13m 42s

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