Update gio requirement from 0.18 to 0.19

Updates the requirements on [gio](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@0.18.0...0.18.4)

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

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

Author: dependabot[bot]

examples/Cargo.toml

@@ -16,7 +16,7 @@ features = ["v7_1"]
 version = "0.18"
 
 [dependencies.gio]
-version = "0.18"
+version = "0.19"
 
 [dependencies.gtk]
 package = "gtk4"

granite/Cargo.toml

@@ -31,7 +31,7 @@ once_cell = "1.17"
 version = "0.18"
 
 [dependencies.gio]
-version = "0.18"
+version = "0.19"
 
 [dependencies.gdk]
 package = "gdk4"