chore: prepare v2.10.1

chore: prepare v2.10.0 (googleapis#2090)

chore: recommend 'pre-autoload-dump' for cleanup command so it works …

…with 'optimize-autoloader' (googleapis#2063)

chore: prepare v2.9.1 (googleapis#2031)

chore: prepare v2.9.0 (googleapis#2029)

Co-authored-by: Brent Shaffer <[email protected]>

chore: prepare v2.8.3 (googleapis#1996)

chore: prepare v2.8.2 (googleapis#1992)

chore: prepare v2.8.1 (googleapis#1981)

chore: prepare v2.8.0 (googleapis#1972)

chore: prepare v2.7.2 (googleapis#1946)