build(deps): update glib requirement from 0.19 to 0.20

Updates the requirements on [glib](https://github.com/gtk-rs/gtk-rs-core) to permit the latest version.
- [Release notes](https://github.com/gtk-rs/gtk-rs-core/releases)
- [Changelog](https://github.com/gtk-rs/gtk-rs-core/blob/master/CHANGELOG.md)
- [Commits](gtk-rs/gtk-rs-core@0.19.0...0.20.0)

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

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

Author: dependabot[bot]

compio-runtime/Cargo.toml

@@ -61,7 +61,7 @@ core-foundation = "0.9.4"
 block2 = "0.5.0"
 
 [target.'cfg(not(any(windows, target_os = "macos")))'.dev-dependencies]
-glib = "0.19"
+glib = "0.20"
 
 [features]
 event = ["dep:cfg-if", "compio-buf/arrayvec"]