Bump github.com/spf13/viper from 1.10.1 to 1.15.0

Bumps [github.com/spf13/viper](https://github.com/spf13/viper) from 1.10.1 to 1.15.0.
- [Release notes](https://github.com/spf13/viper/releases)
- [Commits](spf13/viper@v1.10.1...v1.15.0)

---
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

@@ -4,6 +4,7 @@ go 1.16
 
 require (
 	github.com/CosmWasm/wasmvm v0.16.2
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/cosmos/cosmos-sdk v0.44.5
 	github.com/cosmos/ibc-go v1.2.5
 	github.com/fatih/structs v1.1.0
@@ -18,18 +19,18 @@ require (
 	github.com/regen-network/cosmos-proto v0.3.1
 	github.com/rs/zerolog v1.26.1
 	github.com/snikch/goodman v0.0.0-20171125024755-10e37e294daa
-	github.com/spf13/cast v1.4.1
+	github.com/spf13/cast v1.5.0
 	github.com/spf13/cobra v1.2.1
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.10.1
-	github.com/stretchr/testify v1.7.0
+	github.com/spf13/viper v1.15.0
+	github.com/stretchr/testify v1.8.1
 	github.com/syndtr/goleveldb v1.0.1-0.20200815110645-5c35d600f0ca
 	github.com/tendermint/crypto v0.0.0-20191022145703-50d29ede1e15
 	github.com/tendermint/tendermint v0.34.14
 	github.com/tendermint/tm-db v0.6.4
-	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa
-	google.golang.org/grpc v1.43.0
-	google.golang.org/protobuf v1.27.1
+	google.golang.org/genproto v0.0.0-20221227171554-f9683d7f8bef
+	google.golang.org/grpc v1.52.0
+	google.golang.org/protobuf v1.28.1
 	gopkg.in/yaml.v2 v2.4.0
 )