Bump google.golang.org/grpc from 1.29.1 to 1.53.0 (#295)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.29.1 to 1.53.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.29.1...v1.53.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

go.mod

@@ -8,7 +8,6 @@ require (
 	github.com/dustin/go-humanize v1.0.0
 	github.com/fatih/color v1.9.0 // indirect
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/golang/protobuf v1.4.2 // indirect
 	github.com/google/go-github/v33 v33.0.0
 	github.com/google/slowjam v1.0.0
 	github.com/hashicorp/go-retryablehttp v0.6.6 // indirect
@@ -18,14 +17,11 @@ require (
 	github.com/lib/pq v1.3.0
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/peterbourgon/diskv v2.0.1+incompatible
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.8.1
 	github.com/xanzy/go-gitlab v0.36.0
 	golang.org/x/net v0.7.0 // indirect
-	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
-	golang.org/x/time v0.0.0-20200630173020-3af7569d3a1e // indirect
-	google.golang.org/appengine v1.6.6 // indirect
-	google.golang.org/grpc v1.29.1 // indirect
-	google.golang.org/protobuf v1.25.0 // indirect
+	golang.org/x/oauth2 v0.4.0
+	google.golang.org/grpc v1.53.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v2 v2.2.8
 	k8s.io/klog/v2 v2.0.0