chore: increment client version to 2.12.6 

chore: unimportant whitespace fixes (googleapis#2269) 

chore: attempt to fix doc generation on tag (googleapis#2249) 

fix: bad firebase call (googleapis#2245) 

chore: update psr7 for CVE-2022-24775 (googleapis#2234) 

fix: remove error block of code (googleapis#2163) 

chore: prepare v2.12 (googleapis#2158) 

chore: prepare v2.11.0 (googleapis#2132) 

chore: prepare v2.10.1 

chore: prepare v2.10.0 (googleapis#2090)