deps: update dependency com.google.auto.value:auto-value to v1.7.4 (#1031)
deps: update dependency com.google.auto.value:auto-value to v1.7.4 (#1031)

Co-authored-by: Mira Leung <e0f0c10c2d9fc558beca1314c3b6f4bceafd1e4a@users.noreply.github.com>
Co-authored-by: Elliotte Rusty Harold <36a0b4221826a668920f45c6a4f483d0b710d246@users.noreply.github.com>
Co-authored-by: Jeff Ching <21aaffda9718a203d3f6dfde95bf7c5668b929a6@google.com>
vam-google/gax-java,googleapis/gax-java,googleapis/gax-java,vam-google/gax-java