Sims

Bump github.com/cometbft/cometbft to v0.38.10 (from 0.38.10-pio-1). #6878

Job	Run time
setup	10s
build-linux	1m 8s
go-test-single-db (nondeterminism, ubuntu-latest)	4m 50s
runsim (import-export, goleveldb, ubuntu-latest)	14m 44s
go-test-single-db (benchmark-invariants, ubuntu-latest)	3m 11s
go-test-multi-db (simple, goleveldb, ubuntu-latest)	2m 42s
runsim (multi-seed-short, goleveldb, ubuntu-latest)	14m 53s
go-test-multi-db (benchmark, goleveldb, ubuntu-latest)	3m 44s
runsim (after-import, goleveldb, ubuntu-latest)	18m 5s
	1h 3m 27s

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