Update bitflags requirement from 1.2 to 2.0

Updates the requirements on [bitflags](https://github.com/bitflags/bitflags) to permit the latest version.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md)
- [Commits](bitflags/bitflags@1.2.0...2.0.0)

---
updated-dependencies:
- dependency-name: bitflags
  dependency-type: direct:production
...

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

Cargo.toml

@@ -26,7 +26,7 @@ serialize = ["serde", "serde_derive"]
 cli = ["display", "clap"]
 
 [dependencies]
-bitflags = "1.2"
+bitflags = "2.0"
 serde = {version = "1.0", default-features = false, optional = true}
 serde_derive = {version = "1.0", optional = true}
 serde_json = {version = "1.0", optional = true}