devapp/owners: remove mvdan from go/src/cmd/vet

The bulk of the source was refactored years ago with go/analysis and
moved into x/tools, and I haven't done any work to any parts of it
since.

I'm still interested in tools in general, but I'm not an owner of any of
it anymore. I don't have plans to pick that up again, for now.

Change-Id: Icbabeb5a091be816b90693c135af682a7910fa3a
Reviewed-on: https://go-review.googlesource.com/c/build/+/218458
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/devapp/owners/table.go b/devapp/owners/table.go
index ef990a6..8879a78 100644
--- a/devapp/owners/table.go
+++ b/devapp/owners/table.go
@@ -201,7 +201,7 @@
 	},
 	"go/src/cmd/vet": {
 		Primary:   []Owner{adonovan},
-		Secondary: []Owner{josharian, mvdan},
+		Secondary: []Owner{josharian},
 	},
 	"go/src/compress/bzip2": {
 		Primary:   []Owner{joetsai},