Update numpy requirement from <1.20 to <1.27

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...v1.26.0)

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

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

requirements.txt

@@ -3,7 +3,7 @@ compliance-checker>=4.1.1
 gsw>=3.4.0,<4.0
 matplotlib
 netCDF4
-numpy<1.20
+numpy<1.27
 openssl<3.0  # No idea why this is required to get mamba to build the env
 pandas>=1.2,<2.0
 pocean-core>=3.0.0,<4.0