fix(deps): bump bitflags from 2.9.1 to 2.9.4

Bumps [bitflags](https://github.com/bitflags/bitflags) from 2.9.1 to 2.9.4.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md)
- [Commits](bitflags/bitflags@2.9.1...2.9.4)

---
updated-dependencies:
- dependency-name: bitflags
  dependency-version: 2.9.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -31,7 +31,7 @@ aws-smithy-runtime-api = "1.6.1"
 aws-smithy-types = "1.2.10"
 aws-types = "1.3.0"
 base64 = "0.22.1"
-bitflags = "2.9.0"
+bitflags = "2.9.4"
 bstr = "1.12.0"
 bytes = "1.10.1"
 camino = { version = "1.1.3", features = ["serde1"] }