Update module google.golang.org/grpc to v1.38.0

This MR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc	require	minor	v1.37.0 -> v1.38.0

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Release Notes

grpc/grpc-go

v1.38.0

Compare Source

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)
• xds: support inline RDS resource from LDS response (#​4299)
• xds: server side support is now experimentally available
• server: add ForceServerCodec() to set a custom encoding.Codec on the server (#​4205)
  • Special Thanks: @​ash2k

Performance Improvements

• metadata: reduce memory footprint in FromOutgoingContext (#​4360)
  • Special Thanks: @​irfansharif

Bug Fixes

• xds/balancergroup: fix rare memory leak after closing ClientConn (#​4308)

Documentation

• examples: update xds examples for PSM security (#​4256)
• grpc: improve docs on StreamDesc (#​4397)

v1.37.1

Compare Source

• client: fix rare panic when shutting down client while receiving the first name resolver update (#​4398)
• client: fix leaked addrConn struct when addresses are updated (#​4347)
• xds/resolver: prevent panic when two LDS updates are receives without RDS in between (#​4327)

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