build: Bump bitflags from 2.6.0 to 2.9.0

Bumps [bitflags](https://github.com/bitflags/bitflags) from 2.6.0 to 2.9.0.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md)
- [Commits](https://github.com/bitflags/bitflags/compare/2.6.0...2.9.0)

---
updated-dependencies:
- dependency-name: bitflags
  dependency-version: 2.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vmm/Cargo.toml

@@ -29,7 +29,7 @@ acpi_tables = { workspace = true }
 anyhow = "1.0.94"
 arc-swap = "1.7.1"
 arch = { path = "../arch" }
-bitflags = "2.6.0"
+bitflags = "2.9.0"
 block = { path = "../block" }
 blocking = { version = "1.6.1", optional = true }
 cfg-if = "1.0.0"