Update Rust crate glib to ^0.19.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
glib (source)	dependencies	patch	^0.19.3 -> ^0.19.4

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Release Notes

gtk-rs/gtk-rs-core (glib)

### [`v0.19.4`](https://togithub.com/gtk-rs/gtk-rs-core/releases/tag/0.19.4) [Compare Source](https://togithub.com/gtk-rs/gtk-rs-core/compare/0.19.3...0.19.4) Bilal Elmoussaoui: Fix nightly clippy warnings gio: Stop re-exporting all the types in prelude gio: Move guards to trait definitions gio/socket: Replace c_int import with full qualifier gio/tests: Guard variable that is used on windows only builds typos: Ignore guid false-positive Fabio Valentini: glib: fix UB in VariantStrIter::impl_get Maximiliano Sandoval: Document values of Continue and Break Sebastian Dröge: Work around rustdoc-stripper bug Fix glib compiletest expected output for Rust 1.77 Update Cargo.lock Revert "deny: Add heck 0.4 to the ignore list" Update version to 0.19.4 Ville Hakulinen: docs: `construct` attribute for `glib::Properties` docs: fix typo

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