Increase the number of pvf execute workers #17604

Job	Run time
check-dependency-rules	9s
check-workspace	20s
check-fail-ci	14s
check-readme	3m 11s
check-markdown	15s
preflight / preflight	41s
preflight / ci-versions	1m 13s
fmt	1m 12s
check-toml-format	1m 5s
check-rust-feature-propagation	2m 1s
test-rust-features	2m 6s
check-umbrella	2m 16s
All quick checks passed	1s
	14m 44s

Provide feedback