Fix --no-julia; declare missing dependencies

[tkf]

No description provided.

[codecov]

Codecov Report

Merging #469 (4d0e612) into master (a5290c4) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #469   +/-   ##
=======================================
  Coverage   89.04%   89.04%           
=======================================
  Files          39       39           
  Lines        2273     2273           
=======================================
  Hits         2024     2024           
  Misses        249      249           

Impacted Files	Coverage Δ
src/julia/tests/test_magic.py	98.85% <100.00%> (ø)
src/julia/tests/test_plugin.py	93.75% <100.00%> (ø)

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