build(deps): bump google.golang.org/grpc from 1.67.1 to 1.69.0 in /ext_authz/auth/grpc-service in the examples-ext-authz group across 1 directory

build(deps): bump google.golang.org/grpc from 1.67.1 to 1.69.0 in /ext_authz/auth/grpc-service in the examples-ext-authz group across 1 directory #861