fix(deps): update module google.golang.org/grpc to v1.56.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/grpc	require	minor	v1.55.0 -> v1.56.0

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Release Notes

grpc/grpc-go

v1.56.0: Release 1.56.0

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New Features

• client: support channel idleness using WithIdleTimeout dial option (#​6263)
  • This feature is currently disabled by default, but will be enabled with a 30 minute default in the future.
• client: when using pickfirst, keep channel state in TRANSIENT_FAILURE until it becomes READY (gRFC A62) (#​6306)
• xds: Add support for Custom LB Policies (gRFC A52) (#​6224)
• xds: support pick_first Custom LB policy (gRFC A62) (#​6314) (#​6317)
• client: add support for pickfirst address shuffling (gRFC A62) (#​6311)
• xds: Add support for String Matcher Header Matcher in RDS (#​6313)
• xds/outlierdetection: Add Channelz Logger to Outlier Detection LB (#​6145)
  • Special Thanks: @​s-matyukevich
• xds: enable RLS in xDS by default (#​6343)
• orca: add support for application_utilization field and missing range checks on several metrics setters
• balancer/weightedroundrobin: add new LB policy for balancing between backends based on their load reports (gRFC A58) (#​6241)
• authz: add conversion of json to RBAC Audit Logging config (#​6192)
• authz: add support for stdout logger (#​6230 and #​6298)

Bug Fixes

• orca: fix a race at startup of out-of-band metric subscriptions that would cause the report interval to request 0 (#​6245)
• xds/xdsresource: Fix Outlier Detection Config Handling and correctly set xDS Defaults (#​6361)
• xds/outlierdetection: Fix Outlier Detection Config Handling by setting defaults in ParseConfig() (#​6361)

API Changes

• orca: allow a ServerMetricsProvider to be passed to the ORCA service and ServerOption (#​6223)

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