Update lxml requirement from <=5.3.0 to <=5.3.1

Updates the requirements on [lxml](https://github.com/lxml/lxml) to permit the latest version.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-0.5.1...lxml-5.3.1)

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

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

pyproject.toml

@@ -30,7 +30,7 @@ classifiers = [
 ]
 dependencies = [
     "numpy <= 2.2.2",
-    "lxml <= 5.3.0",
+    "lxml <= 5.3.1",
     "pooch <= v1.8.2",
     "importlib-resources; python_version <= '3.8'",
     "importlib-metadata; python_version <= '3.8'"