Upgrade grpc to v1.53.0, as preparation for introducing OpenTelemetry,
which depends on that grpc version.
Two changes to our own code were necessitated by upstream changes:
1. Add a stub implementation of GetOrBuildProducer: this was added to
the balancer.SubConn interface by grpc v1.51.0
2. Change use of Endpoint field to Endpoint() method: the field was
removed and replaced by a method in
https://github.com/grpc/grpc-go/pull/5852. This also means that our
tests can't set the .Endpoint field, so the tests are updated to use the
.URL field instead, and a helper has been added to make that easy.
Part of #6361
Reverts letsencrypt/boulder#5963
Turns out the tests are still flaky -- using the `grpc.WaitForReady(true)`
connection option results in sometimes seeing 9 entries added to the
purger queue, and sometimes 10 entries. Reverting because flakiness
on main should not be tolerated.
Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.36.1 to 1.44.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.36.1...v1.44.0)
Also update akamai-purger integration test to avoid experimental API.
The `conn.GetState()` API is marked experimental and may change behavior
at any time. It appears to have changed between v1.36.1 and v1.44.0,
and so the akamai-purger integration tests which rely on it break.
Rather than writing our own loop which polls `conn.GetState()`, just
use the stable `WaitForReady(true)` connection option, and apply it to
all connections by setting it as a default option in the dial options.
protoc now generates grpc code in a separate file from protobuf code.
Also, grpc servers are now required to embed an "unimplemented"
interface from the generated .pb.go file, which provides forward
compatibility.
Update the generate.go files since the invocation for protoc has changed
with the split into .pb.org and _grpc.pb.go.
Fixes#5368
dependabot[bot]
Matthew McPherrin
Aaron Gable
Aaron Gable
Jacob Hoffman-Andrews