build(deps): update strum_macros requirement from 0.27.1 to 0.28.0

Updates the requirements on [strum_macros](https://github.com/Peternator7/strum) to permit the latest version.
- [Release notes](https://github.com/Peternator7/strum/releases)
- [Changelog](https://github.com/Peternator7/strum/blob/master/CHANGELOG.md)
- [Commits](Peternator7/strum@v0.27.1...v0.28.0)

---
updated-dependencies:
- dependency-name: strum_macros
  dependency-version: 0.28.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

keymap_parser/Cargo.toml

@@ -11,7 +11,7 @@ edition.workspace = true
 [dependencies]
 serde = { version = "1.0.219", features = ["derive"] }
 strum = "0.28.0"
-strum_macros = "0.27.1"
+strum_macros = "0.28.0"
 
 [dev-dependencies]
 toml = "1.0.1"