lnrpc: run make rpc

The docker image have been updated so we are using another protobuf
version to generate the files. The generate files include the version of
the compiler used to creating them, so we need this commit to pass the
`rpc-check` step in our CI.

lnrpc/devrpc/dev.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.30.0
-// 	protoc        v3.6.1
+// 	protoc        v3.21.12
 // source: devrpc/dev.proto
 
 package devrpc