Update urllib3 requirement from <2.5,>=2.1 to >=2.1,<2.6

Updates the requirements on [urllib3](https://github.com/urllib3/urllib3) to permit the latest version.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@2.1.0...2.5.0)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-version: 2.5.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

setup.cfg

@@ -33,7 +33,7 @@ install_requires =
     vega >= 3.5,<4.2
     websockets >= 14.0,<16
     xarray >=0.19,<2025.5
-    urllib3 >= 2.1, < 2.5
+    urllib3 >= 2.1, < 2.6
     pydantic >= 2.10.6, < 2.12
     skl2onnx >=1.17,<2 ; python_version<"3.13"
     skl2onnx @ git+https://github.com/onnx/sklearn-onnx@1035fdf ; python_version>="3.13" # TODO: remove when skl2onnx 1.19 is released