require P4est.jl v0.4.12

[ranocha]

We got test failures caused to a broken build of P4est_jll.jl again, see #2185 (comment). To avoid this, we fixed the version of P4est_jll.jl in P4est.jl v0.4.12. However, the Julia package manager decides to prefer a newer version of the jll with an older version of P4est.jl. Thus, I have updated the compat bound of P4est.jl to avoid this issue.

[github-actions]

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Created with ❤️ by the Trixi.jl community.

[JoshuaLampert]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.39%. Comparing base (abe8640) to head (cf58340).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2189   +/-   ##
=======================================
  Coverage   96.39%   96.39%           
=======================================
  Files         483      483           
  Lines       38325    38325           
=======================================
  Hits        36941    36941           
  Misses       1384     1384           

Flag	Coverage Δ
unittests	96.39% <ø> (ø)

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