Update f90wrap to 0.2.15 as minimum to ensure compatibility with numpy 2.0+

[reuterbal]

Note: Draft PR to trigger tests

What it says on the tin:

• Update f90wrap to 0.2.15 as minimum version, which restores compatibility with numpy 2.0 (https://github.com/jameskermode/f90wrap/releases/tag/v0.2.15)
• That allows to remove the restriction numpy<1.24
• Which allows to enable Python 12 as supported Python version
• ...and Python 12 added to the Github actions test matrix

[github-actions]

Documentation for this branch can be viewed at https://sites.ecmwf.int/docs/loki/407/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.57%. Comparing base (b6eb817) to head (eedf2f1).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #407      +/-   ##
==========================================
- Coverage   95.57%   95.57%   -0.01%     
==========================================
  Files         201      201              
  Lines       39810    39833      +23     
==========================================
+ Hits        38050    38071      +21     
- Misses       1760     1762       +2     

Flag	Coverage Δ
lint_rules	96.39% <ø> (ø)
loki	95.56% <ø> (-0.01%)	⬇️

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[reuterbal]

OK, the impact of the changes in f90wrap for support of Python 12 seems to be rather extensive: it mandates switching to meson (which somehow doesn't get installed reliably), requires ninja as build backend (which definitely doesn't get installed reliably) and somehow forgets to compile / use the source files before compiling the wrapper library.

We don't have Python 3.12 available on the cluster, yet, but the problems can be replicated locally on MacOS. Hence, I limit the scope of this PR to supporting latest numpy via enforcing a recent f90wrap version, and we can look into Python 3.12 support separately.

[mlange05]

Sounds sensible. GTG