Update egui_extras requirement from 0.27.2 to 0.28.1

Updates the requirements on [egui_extras](https://github.com/emilk/egui) to permit the latest version.
- [Release notes](https://github.com/emilk/egui/releases)
- [Changelog](https://github.com/emilk/egui/blob/master/CHANGELOG.md)
- [Commits](emilk/egui@0.27.2...0.28.1)

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

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

Cargo.toml

@@ -31,7 +31,7 @@ eframe = { version = "0.27.2", default-features = false, features = [
 egui = { version = "0.27.2", default-features = false, features = [
     "persistence",
 ] }
-egui_extras = "0.27.2"
+egui_extras = "0.28.1"
 hex = "0.4.3"
 plist = "1.6.1"
 rfd = "0.14.1"