Update bitflags requirement from 1.3 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@1.3.0...2.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -25,7 +25,7 @@ integer128 = []
 
 [dependencies]
 base64 = "0.21"
-bitflags = "1.3"
+bitflags = "2.0"
 indexmap = { version = "1.9", features = ["serde-1"], optional = true }
 # serde supports i128/u128 from 1.0.60 onwards
 serde = "1.0.60"