Update gio requirement from 0.19 to 0.20

[dependabot[bot]]

Updates the requirements on gio to permit the latest version.

Release notes

Sourced from gio's releases.

0.20.0

Bilal Elmoussaoui:
      cairo: Use workspaces
      cairo: Fix ffi glib crate name
      cairo: Add missing version
      Post release version bump
      ci/docs: Deploy 0.19 release
      chore: Drop no longer needed deny skips
      docs: Move metadata back to packages
      glib: Requires Upgrade on Downgrade::Weak type
      Update clone.rs
      glib: Mark GParamSpec types as manual
      glib: Don't use macros to generate ParamSpec structs
      Update gir/gir-files submodules
      Regenerate with latest gir/gir-files
      Revert "glib: Auto generate various win32 functions"
      glib/gio: Remove no longer used version/ignore
      glib: Ignore new unsafe functions
      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
      Regenerate with latest gir/gir-files
      pango: Mark Item.get_char_offset param as const
      pango: Re-export v1_54 feature
      ci: Bump pango feature
      pango: Downgrade require version for v1.54
      Fix various nightly clippy warnings
      Update gir submodule
      Regenerate with latest gir
      Adapt to no longer renamed ffi crates
      cairo: Add missing doc aliases
      gio/tests: Remove no longer useful guard
      Revert "build(deps): bump freetype-rs from 0.36.0 to 0.37.0"
      Update dependencies
Carlos Martín Nieto:

gio: Add a method to get a stream of incoming connections to SocketListener

gio: add SocketListenerExtManual to Gir.toml
DaKnig:

spell fix
Fabio Valentini:

glib: fix UB in VariantStrIter::impl_get
Fina Wilke:

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Commits

• 184abe8 Update Cargo.lock
• 673fd1f Regenerate with latest gir-files
• a9d4e46 Update gir-files
• b2d7678 Merge pull request #1454 from carlosmn/cmn/socket-listener-stream
• 08b94be gio: add SocketListenerExtManual to Gir.toml
• c0c0de7 gio: Add a method to get a stream of incoming connections to SocketListener
• a9c1b6a Merge pull request #1453 from sdroege/update-gir-files
• 95036c8 Update Cargo.lock
• 1951c67 Regenerate with latest gir / gir-files
• f697f7c glib-sys: Add version for q_sort_array()
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like gio is up-to-date now, so this is no longer needed.