v3.0.0-rc43

Changelog

cc69d15 Switch the store RWMutex to a pair of categorical mutices.
9e0c20e Benchmark adds to the metrics store.
77cb9d6 No need for IMPORTS definition with go mod download.
c277f15 Use go mod download to fetch deps instead of doing it manually.
8262f12 Remove crossbuild target now we use goreleaser.
73d14bf Don't include Merge commits in changelog.
b2de91a Remove unused parameter from TestStartServer.
c9a2351 Reenable the unix socket listen test.