Bump numpy from 1.26.3 to 1.26.4 in /requirements

Bumps [numpy](https://github.com/numpy/numpy) from 1.26.3 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@v1.26.3...v1.26.4)

---
updated-dependencies:
- dependency-name: numpy
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements/required.txt

@@ -1,7 +1,7 @@
 bmipy==2.0.1
 matplotlib==3.8.2
 netcdf4==1.6.5
-numpy==1.26.3
+numpy==1.26.4
 pandas==2.2.2
 pyshp==2.3.1
 pyyaml==6.0.1