Update numpy requirement in /python/alibiexplainer in the pip group

Updates the requirements on [numpy](https://github.com/numpy/numpy) to permit the latest version.

Updates `numpy` to 1.26.4
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/RELEASE_WALKTHROUGH.rst)
- [Commits](numpy/numpy@v0.2.0...v1.26.4)

---
updated-dependencies:
- dependency-name: numpy
  dependency-type: direct:production
  dependency-group: pip
...

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

python/alibiexplainer/setup.py

@@ -44,7 +44,7 @@
         "grpcio>=1.22.0",
         "xgboost==1.0.2",
         "shap==0.36.0",
-        "numpy<1.19.0"
+        "numpy<1.27.0"
     ],
     tests_require=tests_require,
     extras_require={'test': tests_require}