fix(deps): update google.golang.org/genproto commit hash to a8c4777

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
google.golang.org/genproto	require	digest	5ede27f -> a8c4777

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: docker run --rm --name=renovate_go --label=renovate_child -v "/mnt/renovate/gh/DoNewsCode/core-demo":"/mnt/renovate/gh/DoNewsCode/core-demo" -v "/tmp/renovate-cache":"/tmp/renovate-cache" -v "/tmp/renovate-cache/others/go":"/tmp/renovate-cache/others/go" -e GOPATH -e CGO_ENABLED -w "/mnt/renovate/gh/DoNewsCode/core-demo" docker.io/renovate/go:1.16.3 bash -l -c "git config --global url.\"https://**redacted**@github.com/\".insteadOf \"https://github.com/\" && go get -d ./..."
go: github.com/DoNewsCode/core@v0.4.2 (replaced by /Users/donew/src/std): reading /Users/donew/src/std/go.mod: open /Users/donew/src/std/go.mod: no such file or directory