[deps] Platform: Update Rust crate gio to v0.19.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
gio (source)	dependencies	patch	=0.19.5 -> =0.19.8

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Release Notes

gtk-rs/gtk-rs-core (gio)

v0.19.8

Compare Source

Bilal Elmoussaoui:
      glib: Requires Upgrade on Downgrade::Weak type
      glib: Mark GParamSpec types as manual
      glib: Don't use macros to generate ParamSpec structs
      Fix various nightly clippy warnings

Fina Wilke:
      glib-macros: Fix links in property macros docs
      docs: Fix broken links
      glib: Make links in README.md work in both web and rustdoc

Paolo Borelli:
      ci: bump gvsbuild
      gio: remove Send + Sync requirements from DBusConnection::register_object
      gio: remove Send + Sync requirements also for other GDBus closures
      gio: explicitely ignore DBusConnection::register_object
      Fix cargo fmt
      Derive TransparentPtrType trait for Boxed
      strv: add From implementation from a String array
      Regen with the latest gir from 0.19 branch
      gio: sync test with master

Sebastian Dröge:
      glib: Extend `spawn_from_within()` test to actually use a future that compiles with the normal `spawn()`
      gio: Properly export Win32InputStream / Win32OutputStream traits

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