Bump utils/wesnoth-map-diff from 9b95049 to 637473f

Bumps [utils/wesnoth-map-diff](https://github.com/cooljeanius/wesnoth-map-diff) from `9b95049` to `637473f`.
- [Release notes](https://github.com/cooljeanius/wesnoth-map-diff/releases)
- [Commits](cooljeanius/wesnoth-map-diff@9b95049...637473f)

---
updated-dependencies:
- dependency-name: utils/wesnoth-map-diff
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>