Handle new error message for bad module paths

go list returns a different error message:
go list -m: malformed module path "pkg-errors": missing dot in first path element

go_modules/lib/dependabot/go_modules/update_checker/latest_version_finder.rb

@@ -20,6 +20,7 @@ class LatestVersionFinder
           /404 Not Found/,
           /Repository not found/,
           /unrecognized import path/,
+          /malformed module path/,
           # (Private) module could not be fetched
           /module .*: git ls-remote .*: exit status 128/m.freeze
         ].freeze