chore: update NPZ requirement to 0.4.3 in /docs (#1607)

Updates the requirements on [NPZ](https://github.com/fhs/NPZ.jl) to permit the latest version.
- [Release notes](https://github.com/fhs/NPZ.jl/releases)
- [Commits](https://github.com/fhs/NPZ.jl/commits)

---
updated-dependencies:
- dependency-name: NPZ
  dependency-version: 0.4.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/Project.toml

@@ -63,6 +63,7 @@ LuxLib = "1.3.4"
 LuxTestUtils = "2"
 MLDataDevices = "1.6.10"
 NNlib = "0.9.27"
+NPZ = "0.4.3"
 Optimisers = "0.4.6"
 Printf = "1.10"
 Random = "1.10"