bump: add utils/repology require

A recent commit reworked `require`s to improve performance but this
led to an `uninitialized constant Homebrew::DevCmd::Bump::Repology`
error in `brew bump`. This adds a `utils/repology` `require` to
`dev-cmd/bump.rb` to resolve the error.

Library/Homebrew/dev-cmd/bump.rb

@@ -4,6 +4,7 @@
 require "abstract_command"
 require "bump_version_parser"
 require "livecheck/livecheck"
+require "utils/repology"
 
 module Homebrew
   module DevCmd