ex: Update x11rb requirement from 0.11.0 to 0.12.0

Updates the requirements on [x11rb](https://github.com/psychon/x11rb) to permit the latest version.
- [Changelog](https://github.com/psychon/x11rb/blob/master/doc/changelog.md)
- [Commits](psychon/x11rb@v0.11.0...v0.12.0)

---
updated-dependencies:
- dependency-name: x11rb
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -11,7 +11,7 @@ rust-version = "1.58.1"
 
 [dev-dependencies]
 bytemuck = "1.12.3"
-x11rb = "0.11.0"
+x11rb = "0.12.0"
 
 [workspace]
 members = [