chore(deps-rs): update downcast-rs requirement from 1.2.0 to 2.0.1

Updates the requirements on [downcast-rs](https://github.com/marcianx/downcast-rs) to permit the latest version.
- [Changelog](https://github.com/marcianx/downcast-rs/blob/master/CHANGELOG.md)
- [Commits](marcianx/downcast-rs@v1.2.0...v1.2.1)

---
updated-dependencies:
- dependency-name: downcast-rs
  dependency-type: direct:production
...

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

Cargo.toml

@@ -39,7 +39,7 @@ cool_asserts = "2.0.3"
 criterion = "0.5.1"
 delegate = "0.13.0"
 derive_more = "1.0.0"
-downcast-rs = "1.2.0"
+downcast-rs = "2.0.1"
 enum_dispatch = "0.3.11"
 html-escape = "0.2.13"
 itertools = "0.14.0"