chore(deps): update beartype requirement (#838)

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@v0.19.0...v0.20.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -29,7 +29,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "beartype>=0.19,<0.20",
+    "beartype>=0.19,<0.21",
     "coverage>=7,<8",
     "coveralls>=4,<5",
     "ipykernel>=6,<7",