chore(deps): update module google.golang.org/grpc to v1.31.0 (master)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc	require	minor	v1.30.0 -> v1.31.0

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Release Notes

grpc/grpc-go

v1.31.0

Compare Source

API Changes

• balancer: remove deprecated type aliases (#​3742)

New Features

• The following new xDS functionalities are added in this release (xDS features supported in a given release are documented here):
  • Requests matching based on path (prefix, full path and safe regex) and headers
  • Requests routing to multiple clusters based on weights
• service config: add default method config support (#​3684)
  • Special Thanks: @​amenzhinsky
• credentials/sts: PerRPCCreds Implementation (#​3696)
• credentials: check and expose SPIFFE ID (#​3626)
• protoc-gen-go-grpc: support for proto3 field presence (#​3752)

Bug Fixes

• client: set auth header to localhost for unix target (#​3730)

Documentation

• doc: mark CustomCodec as deprecated (#​3698)
• examples: cleanup README.md (#​3738)
• doc: fix references to status methods (#​3702)
  • Special Thanks: @​evanlimanto

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