build(deps): bump github.com/spf13/viper from 1.7.0 to 1.8.1

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.7.0 to 1.8.1.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.7.0...v1.8.1)

---
updated-dependencies:
- dependency-name: github.com/spf13/viper
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -13,19 +13,16 @@ require (
 	github.com/gin-contrib/cors v1.3.1
 	github.com/gin-gonic/gin v1.7.2
 	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/protobuf v1.4.3
-	github.com/google/go-cmp v0.5.4 // indirect
+	github.com/golang/protobuf v1.5.2
 	github.com/google/uuid v1.2.0
 	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2
-	github.com/json-iterator/go v1.1.10 // indirect
 	github.com/spf13/cobra v1.1.3
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.7.0
+	github.com/spf13/viper v1.8.1
 	github.com/stretchr/testify v1.7.0
 	github.com/vektah/gqlparser/v2 v2.1.0
-	go.uber.org/zap v1.16.0
-	google.golang.org/genproto v0.0.0-20200806141610-86f49bd18e98 // indirect
-	google.golang.org/grpc v1.36.0
+	go.uber.org/zap v1.17.0
+	google.golang.org/grpc v1.38.0
 	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0
-	google.golang.org/protobuf v1.25.0
+	google.golang.org/protobuf v1.26.0
 )