chore(deps): update gunicorn requirement in /services/python-bridge (#875)

Updates the requirements on [gunicorn](https://github.com/benoitc/gunicorn) to permit the latest version.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@23.0.0...25.3.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-version: 25.3.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

services/python-bridge/pyproject.toml

@@ -16,7 +16,7 @@ requires-python = ">=3.13"
 dependencies = [
 	# Web framework + WSGI server
 	"Flask>=3.1,<4",
-	"gunicorn>=23,<24",
+	"gunicorn>=23,<26",
 	"pydantic>=2.12,<3",
 
 	# Polis clustering (red-dwarf)