build(deps): update netcal requirement in /requirements

Updates the requirements on [netcal](https://github.com/EFS-OpenSource/calibration-framework) to permit the latest version.
- [Release notes](https://github.com/EFS-OpenSource/calibration-framework/releases)
- [Commits](EFS-OpenSource/calibration-framework@r1.1...r1.3.6)

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

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

requirements/classification_test.txt

@@ -2,6 +2,6 @@
 #  in case you want to preserve/enforce restrictions on the latest compatible version, add "strict" as an in-line comment
 
 pandas >=1.4.0, <=2.2.2
-netcal >1.0.0, <=1.3.5  # calibration_error
+netcal >1.0.0, <=1.3.6  # calibration_error
 numpy <2.1.0
 fairlearn # group_fairness