MNT: (deps): Bump numpy from 2.0.1 to 2.1.0 in /ci (#316)

Bumps [numpy](https://github.com/numpy/numpy) from 2.0.1 to 2.1.0.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/main/doc/RELEASE_WALKTHROUGH.rst)
- [Commits](numpy/numpy@v2.0.1...v2.1.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

ci/requirements.txt

@@ -1,6 +1,6 @@
 python>=3.7
 matplotlib==3.9.1
-numpy==2.0.1
+numpy==2.1.0
 pandas==2.2.2
 netcdf4==1.7.1.post1
 erddapy==2.2.0