Bump github.com/klaytn/klaytn from 1.10.2 to 1.12.1

Bumps [github.com/klaytn/klaytn](https://github.com/klaytn/klaytn) from 1.10.2 to 1.12.1.
- [Release notes](https://github.com/klaytn/klaytn/releases)
- [Commits](klaytn/klaytn@v1.10.2...v1.12.1)

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

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

go.mod

@@ -2,11 +2,11 @@ module github.com/klaytn/rosetta-klaytn
 
 require (
 	github.com/fatih/color v1.13.0
-	github.com/klaytn/klaytn v1.10.2
+	github.com/klaytn/klaytn v1.12.1
 	github.com/klaytn/rosetta-sdk-go-klaytn v0.7.10
 	github.com/spf13/cobra v1.5.0
-	github.com/stretchr/testify v1.8.0
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	github.com/stretchr/testify v1.8.4
+	golang.org/x/sync v0.1.0
 )
 
 require (
@@ -15,7 +15,6 @@ require (
 	github.com/edsrzf/mmap-go v1.1.0 // indirect
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
 	github.com/go-stack/stack v1.8.1 // indirect
-	github.com/golang/mock v1.6.0 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.2-0.20181231171920-c182affec369 // indirect
 	github.com/pbnjay/memory v0.0.0-20210728143218-7b4eea64cf58 // indirect
@@ -25,11 +24,6 @@ require (
 	go.uber.org/goleak v1.1.12 // indirect
 	go.uber.org/multierr v1.8.0 // indirect
 	go.uber.org/zap v1.21.0 // indirect
-	go4.org/unsafe/assume-no-moving-gc v0.0.0-20220617031537-928513b29760 // indirect
-	golang.org/x/net v0.0.0-20220325170049-de3da57026de // indirect
-	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
-	google.golang.org/genproto v0.0.0-20220324131243-acbaeb5b85eb // indirect
-	google.golang.org/protobuf v1.28.0 // indirect
 )
 
 go 1.16