build: Bump bitflags from 2.11.1 to 2.12.1

Bumps [bitflags](https://github.com/bitflags/bitflags) from 2.11.1 to 2.12.1.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md)
- [Commits](bitflags/bitflags@2.11.1...2.12.1)

---
updated-dependencies:
- dependency-name: bitflags
  dependency-version: 2.12.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -26,7 +26,7 @@ coreboot = []
 efi-var = []
 
 [dependencies]
-bitflags = "2.11.1"
+bitflags = "2.12.1"
 atomic_refcell = "0.1.14"
 r-efi = { version = "5.3.0", features = ["efiapi"] }
 heapless = "0.9.3"