.golangci.yml: speed up linter by updating start commit

With this we allow the linter to only look at recent changes, since
everything between that old commit and this most recent one has been
linted correctly anyway.

.golangci.yml

@@ -231,7 +231,7 @@ linters:
 
 issues:
   # Only show newly introduced problems.
-  new-from-rev: 77c7f776d5cbf9e147edc81d65ae5ba177a684e5
+  new-from-rev: 03eab4db64540aa5f789c617793e4459f4ba9e78
 
   # Skip autogenerated files for mobile and gRPC as well as copied code for
   # internal use.