Bump google.golang.org/grpc from 1.21.0 to 1.39.0

[dependabot-preview[bot]]

Bumps google.golang.org/grpc from 1.21.0 to 1.39.0.

Release notes

Sourced from google.golang.org/grpc's releases.

Release 1.39.0

Behavior Changes

• csds: return empty response if xds client is not set (#4505)
• metadata: convert keys to lowercase in FromContext() (#4416)

New Features

• xds: add GetServiceInfo to GRPCServer (#4507)
  • Special Thanks: @​amenzhinsky
• xds: add test-only injection of xds config to client and server (#4476)
• server: allow PreparedMsgs to work for server streams (#3480)
  • Special Thanks: @​eafzali

Performance Improvements

• transport: remove decodeState from client & server to reduce allocations (#4423)
  • Special Thanks: @​JNProtzman

Bug Fixes

• server: return UNIMPLEMENTED on receipt of malformed method name (#4464)
• xds/rds: use 100 as default weighted cluster totalWeight instead of 0 (#4439)
  • Special Thanks: @​alpha-baby
• transport: unblock read throttling when controlbuf exits (#4447)
• client: fix status code to return Unavailable for servers shutting down instead of Unknown (#4561)

Documentation

• doc: fix broken benchmark dashboard link in README.md (#4503)
  • Special Thanks: @​laststem
• example: improve hello world server with starting msg (#4468)
  • Special Thanks: @​dkkb
• client: Clarify that WaitForReady will block for CONNECTING channels (#4477)
  • Special Thanks: @​evanj

Release 1.38.0

API Changes

• reflection: accept interface instead of grpc.Server struct in Register() (#4340)
• resolver: add error return value from ClientConn.UpdateState (#4270)

Behavior Changes

• client: do not poll name resolver when errors or bad updates are reported (#4270)
• transport: InTapHandle may return RPC status errors; no longer RST_STREAMs (#4365)

New Features

• client: propagate connection error causes to RPC status (#4311, #4316)

... (truncated)

Commits

• ebf6a4b Change version to 1.39.0 (#4541)
• 20551e1 internal/transport: do not mask ConnectionError (#4561) (#4569)
• 22c5358 xds: add HashPolicy fields to RDS update (#4521)
• 4554924 internal: fix deadlock during switch_balancer and NewSubConn() (#4536)
• 2d3b1f9 grpc: prevent deadlock in Test/ClientUpdatesParamsAfterGoAway on failure (#4534)
• 6351a55 xds: remove env var protetion of advanced routing features (#4529)
• 95e48a8 Add GetServiceInfo to xds.GRPCServer (#4507)
• aa1169a vet: remove support for non-module-aware Go versions (#4530)
• b1418a6 xds: export XDSClient interface and use it in balancer tests (#4510)
• 7301a31 c2p: add random number to xDS node ID in google-c2p resolver (#4519)
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