build(deps): bump bitflags from 2.9.0 to 2.9.1

Bumps [bitflags](https://github.com/bitflags/bitflags) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md)
- [Commits](bitflags/bitflags@2.9.0...2.9.1)

---
updated-dependencies:
- dependency-name: bitflags
  dependency-version: 2.9.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -36,7 +36,7 @@ rust-version = "1.83"
 
 [workspace.dependencies]
 libc = "0.2"
-bitflags = "2.8"
+bitflags = "2.9"
 gir-format-check = "^0.1"
 glib-sys = { path = "glib/sys", version = "0.21" }
 gobject-sys = { path = "glib/gobject-sys", version = "0.21" }