Cap numpy version to less than 2.0.0 (#68)

## Describe your changes

Nerual-lam is at the moment not completely compatible with the new
release of numpy 2. This PR changes the numpy version in
requirements.txt to < 2.0.0.

## Issue Link

#67

## Type of change

- [x] 🐛 Bug fix (non-breaking change that fixes an issue)
- [ ] ✨ New feature (non-breaking change that adds functionality)
- [ ] 💥 Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] 📖 Documentation (Addition or improvements to documentation)

## Checklist before requesting a review

- [x] My branch is up-to-date with the target branch - if not update
your fork with the changes from the target branch (use `pull` with
`--rebase` option if possible).
- [x] I have performed a self-review of my code
- [x] I have given the PR a name that clearly describes the change,
written in imperative form
([context](https://www.gitkraken.com/learn/git/best-practices/git-commit-message#using-imperative-verb-form)).
- [x] I have requested a reviewer and an assignee (assignee is
responsible for merging)

## Checklist for reviewers

Each PR comes with its own improvements and flaws. The reviewer should
check the following:
- [x] the code is readable
- [x] the code is well tested
- [x] the code is documented (including return types and parameters)
- [x] the code is easy to maintain

## Author checklist after completed review

- [x] I have added a line to the CHANGELOG describing this change, in a
section
  reflecting type of change (add section where missing):
  - *added*: when you have added new functionality
  - *changed*: when default behaviour of the code has been changed
  - *fixes*: when your contribution fixes a bug

## Checklist for assignee

- [x] PR is up to date with the base branch
- [x] the tests pass
- [x] author has added an entry to the changelog (and designated the
change as *added*, *changed* or *fixed*)
- Once the PR is ready to be merged, squash commits and merge the PR.

CHANGELOG.md

@@ -88,6 +88,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   [\#52](https://github.com/mllam/neural-lam/pull/52)
   @joeloskarsson
 
+- Cap numpy version to < 2.0.0
+  [\#68](https://github.com/mllam/neural-lam/pull/68)
+  @joeloskarsson
+
 ## [v0.1.0](https://github.com/joeloskarsson/neural-lam/releases/tag/v0.1.0)
 
 First tagged release of `neural-lam`, matching Oskarsson et al 2023 publication

requirements.txt

@@ -1,5 +1,5 @@
 # for all
-numpy>=1.24.2
+numpy>=1.24.2, <2.0.0
 wandb>=0.13.10
 matplotlib>=3.7.0
 scipy>=1.10.0