replace "dep" with "go mod"

A simple "go mod init && go mod tidy && go mod vendor" was enough and
mostly seems to have picked the same revisions of the dependencies as
before. Notable exceptions are klog and gogo/protobuf.

vendor/github.com/json-iterator/go/adapter.go

@@ -16,7 +16,7 @@ func Unmarshal(data []byte, v interface{}) error {
 	return ConfigDefault.Unmarshal(data, v)
 }
 
-// UnmarshalFromString convenient method to read from string instead of []byte
+// UnmarshalFromString is a convenient method to read from string instead of []byte
 func UnmarshalFromString(str string, v interface{}) error {
 	return ConfigDefault.UnmarshalFromString(str, v)
 }