build: bump bitflags from 1.2.1 to 1.3.1

Bumps [bitflags](https://github.com/bitflags/bitflags) from 1.2.1 to 1.3.1.
- [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/1.2.1...1.3.1)

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

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

devices/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 acpi_tables = { path = "../acpi_tables", optional = true }
 anyhow = "1.0.42"
 arch = { path = "../arch" }
-bitflags = "1.2.1"
+bitflags = "1.3.1"
 byteorder = "1.4.3"
 epoll = "4.3.1"
 libc = "0.2.99"