Update module google.golang.org/grpc to v1.34.0 (master)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc	require	minor	v1.33.2 -> v1.34.0

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Release Notes

grpc/grpc-go

v1.34.0

Compare Source

New Features

• client: implement support for "unix" resolver scheme (#​3890)
• rds: allow case_insensitive path matching (#​3997)
• credentials/insecure: implement insecure credentials. (#​3964)
• lrs: handle multiple clusters in LRS stream (#​3935)

Performance Improvements

• encoding/proto: simplify & optimize proto codec (#​3958)

Bug Fixes

• internal/transport: fix a bug causing -bin metadata to be incorrectly encoded (#​3985)
  • Special Thanks: @​dntj
• grpclb: consider IDLE SubConns as connecting (#​4031)
• grpclb: send custom user-agent (#​4011)
• client: use "localhost:port" as authority if target is ":port" (#​4017)
• credentials: fix PerRPCCredentials w/RequireTransportSecurity and security levels (#​3995)

Documentation

• Documentation: fix outgoing metadata example code (#​3979)
  • Special Thanks: @​aaronjheng
• Remove experimental comment from client interceptors (#​3948)
  • Special Thanks: @​hypnoglow
• Documentation: update keepalive.md to add why (#​3993)

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