Support Julia 1.8

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #460 (5c78705) into master (bee73ec) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #460      +/-   ##
==========================================
+ Coverage   89.00%   89.04%   +0.04%     
==========================================
  Files          39       39              
  Lines        2264     2273       +9     
==========================================
+ Hits         2015     2024       +9     
  Misses        249      249              

Impacted Files	Coverage Δ
src/julia/core.py	83.78% <ø> (ø)
src/julia/libjulia.py	92.35% <100.00%> (+0.19%)	⬆️
src/julia/tests/test_sysimage.py	100.00% <100.00%> (ø)

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[tkf]

This fails due to

AttributeError: /opt/hostedtoolcache/julia/nightly/x64/bin/../lib/libjulia.so.1: undefined symbol: jl_typeof

https://github.com/JuliaPy/pyjulia/runs/3991096694?check_suite_focus=true#step:8:139