Re-enable AOT test with Julia nightly

[tkf]

AOT with nightly was disabled in #930 to workaround this failure

┌ Warning: Could not use exact versions of packages in manifest, re-resolving
└ @ Pkg.Operations /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.8/Pkg/src/Operations.jl:1510
Precompiling project...
  ✓ CompilerSupportLibraries_jll
  ✓ OpenBLAS_jll
  ✓ libblastrampoline_jll
  ✓ MacroTools
  ✓ PyCall
  5 dependencies successfully precompiled in 6 seconds. 4 already precompiled.
  Activating project at `~/.julia/environments/v1.8`
ERROR: Unsatisfiable requirements detected for package OpenBLAS_jll [4536629a]:
 OpenBLAS_jll [4536629a] log:
 ├─possible versions are: 0.3.17 or uninstalled
 └─restricted to versions 0.3.13 by an explicit requirement — no versions left

https://github.com/JuliaPy/PyCall.jl/runs/3986291641?check_suite_focus=true#step:9:41

Opening an issue to re-enable this as a reminder.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.97%. Comparing base (f83a11f) to head (bf242eb).
Report is 48 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #931   +/-   ##
=======================================
  Coverage   67.97%   67.97%           
=======================================
  Files          20       20           
  Lines        2033     2033           
=======================================
  Hits         1382     1382           
  Misses        651      651           

Flag	Coverage Δ
unittests	67.97% <ø> (ø)

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[tkf]

It looks like PackageCompiler.jl itself is not testing with nightly at the moment JuliaLang/PackageCompiler.jl@81a01d3