Move to julia 1.11

[benegee]

Change to current julia version 1.11.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.84%. Comparing base (07845ab) to head (69a6d30).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #207      +/-   ##
==========================================
- Coverage   83.92%   81.84%   -2.08%     
==========================================
  Files          21       21              
  Lines         877      876       -1     
  Branches       52       52              
==========================================
- Hits          736      717      -19     
- Misses        137      155      +18     
  Partials        4        4              

Flag	Coverage Δ
unittests	81.84% <100.00%> (-2.08%)	⬇️

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[benegee]

CI currently fails because of a memory issue with p4est examples related to the new t8code version in Trixi. @jmark
I observed this with julia 1.10.6 as well. For unknown reasons it happens with the github runners only when using julia 1.11.

[benegee]

While @jmark fights relentlessly with GC, MPI, and t8code, we can get away with finalizing P4est meshes explicitly.

libtrixi/LibTrixi.jl/src/api_jl.jl

Line 55 in fb276cc

if mesh isa Trixi.T8codeMesh || mesh isa Trixi.P4estMesh