fix(security): explicitly update keypair dependency
fix(security): explicitly update keypair dependency

https://securitylab.github.com/advisories/GHSL-2021-1012-keypair/
Co-authored-by: Justin Beckwith <0b357449eb5b1ce3bad523b6be0681e856776d8e@gmail.com>
googleapis/google-auth-library-nodejs,googleapis/google-auth-library-nodejs