Update numpy requirement from <=1.25.2 to <=1.26.1

Updates the requirements on [numpy](https://github.com/numpy/numpy) to permit the latest version.
- [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...v1.26.1)

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

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

requirements.txt

@@ -5,7 +5,7 @@ dgl==1.0.1
 nxt-gem
 grakel
 pandas
-numpy<=1.25.2
+numpy<=1.26.1
 scipy
 tensorflow
 torch