Updated grpc-go to v1.29.1

[jpkrohling]

Closes #2443

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[annanay25]

This upgrade seems to cover a bunch of breaking changes to client side load balancing in grpc, but since we don't use any of that in the agent, the one change that might affect us is probably this - grpc/grpc#23086

DNS resolutions will now be sorted.

lgtm, modulo the green CI!

[yurishkuro]

test failed

--- FAIL: TestTraceSpanIDMarshalProto (0.00s)
    --- FAIL: TestTraceSpanIDMarshalProto/protobuf (0.00s)
panic: invalid Go type model.TraceID for field jaeger.api_v2.SpanRef.trace_id [recovered]
	panic: invalid Go type model.TraceID for field jaeger.api_v2.SpanRef.trace_id

[jpkrohling]

This update sent be to a rabbit hole, and I think it requires more effort than I'm willing to invest right now. So, I'm updating this PR to bump it to 1.29.1 instead, which does fix the original bug I was trying to solve.

That said, I'll open another issue to track the work for updating gRPC to latest versions and will try to allocate some time to work on it in case we have no volunteers.

[jpkrohling]

Created #2449 to track the upgrade to 1.31.x

[codecov]

Codecov Report

Merging #2445 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2445      +/-   ##
==========================================
- Coverage   95.58%   95.56%   -0.02%     
==========================================
  Files         208      208              
  Lines       10679    10679              
==========================================
- Hits        10207    10205       -2     
- Misses        399      400       +1     
- Partials       73       74       +1     

Impacted Files	Coverage Δ
cmd/query/app/server.go	91.11% <0.00%> (-2.23%)	⬇️
...lugin/sampling/strategystore/adaptive/processor.go	99.20% <0.00%> (-0.80%)	⬇️
plugin/storage/integration/integration.go	80.86% <0.00%> (+0.47%)	⬆️
pkg/discovery/grpcresolver/grpc_resolver.go	100.00% <0.00%> (+1.42%)	⬆️

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