Update beartype requirement from <0.18.0 to <0.20.0

Updates the requirements on [beartype](https://github.com/beartype/beartype) to permit the latest version.
- [Release notes](https://github.com/beartype/beartype/releases)
- [Changelog](https://github.com/beartype/beartype/blob/main/doc/RELEASE.rst)
- [Commits](beartype/beartype@v0.1.0...v0.19.0)

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

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

dagger/requirements.txt

@@ -1,3 +1,3 @@
-beartype<0.18.0
+beartype<0.20.0
 dagger-io~=0.9.7
 python-dotenv