0.21.1

Philipp Jungkamp:
      gio: Fix segfault in ListStore::find_with_equal_func

Rose Davidson:
      cairo: Fix return type for cairo_script_create_for_stream.
      cairo: write-to-stream callbacks should accept const pointers to data

Sebastian Dröge:
      Update gir-files
      Regenerate with latest gir-files
      glib: Fix new clippy warnings
      glib: Only build regex compiletests if the corresponding feature is enabled
      glib: Fix segfault in `List::retain()`
      glib: Compare lengths in `<StrV as PartialEq<[&str]>>::eq` too
      glib: Null-terminate on every iteration in `PtrSlice::extend_from_slice`
      glib: Avoid more integer overflows when reserving space in `PtrSlice` / `Slice` / `StrV`
      Update Cargo.lock
      Update versions to 0.21.1
      cairo: Require cairo-sys-rs >= 0.21.1

Sebastian Wiesner:
      Impl AsFd for FileDescriptorBased

Tomoaki Kawada:
      glib: Fix overflow in `StrV::reserve` when checking capacity
      glib: Fix overflow in `StrV::extend_from_slice` when checking capacity
      glib: Null-terminate on every iteration in `StrV::extend_from_slice`
      glib: Compare lengths in `<StrVRef as PartialEq<[&str]>>::eq`

Zachary S:
      glib: Don't drop `T` if `ThreadGuard<T>` is dropped on the wrong thread.
      glib: Don't double-panic if `ThreadGuard::into_inner` is called on the wrong thread.

dependabot[bot]:
      build(deps): bump criterion from 0.6.0 to 0.7.0