Update plum-dispatch requirement from >=2,<2.3 to >=2,<2.6

Updates the requirements on [plum-dispatch](https://github.com/beartype/plum) to permit the latest version.
- [Release notes](https://github.com/beartype/plum/releases)
- [Commits](beartype/plum@v2.0.0...v2.5.2)

---
updated-dependencies:
- dependency-name: plum-dispatch
  dependency-type: direct:production
...

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

pyproject.toml

@@ -39,7 +39,7 @@ numpy = [
     { version = ">1.22.0,<2.0.0", markers = "python_version ~= '3.12' and (extra == 'numpy' or extra == 'all')", optional = true },
 ]
 orjson = { version = "*", markers = "extra == 'orjson' or extra == 'all'", optional = true }
-plum-dispatch = ">=2,<2.3"
+plum-dispatch = ">=2,<2.6"
 beartype = ">=0.18.4"
 sqlalchemy = { version = ">2", markers = "extra == 'sqlalchemy' or extra == 'all'", optional = true }