pycodegen: fix secondaryFiles DSL

[mr-c]

No description provided.

[codecov]

Codecov Report

Merging #360 (711e7ac) into main (0be3a0d) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #360      +/-   ##
==========================================
+ Coverage   69.89%   69.96%   +0.06%     
==========================================
  Files          16       16              
  Lines        2860     2860              
  Branches      750      750              
==========================================
+ Hits         1999     2001       +2     
  Misses        674      674              
+ Partials      187      185       -2     

Impacted Files	Coverage Δ
schema_salad/codegen_base.py	94.59% <100.00%> (ø)
schema_salad/ref_resolver.py	84.83% <0.00%> (+0.14%)	⬆️
schema_salad/fetcher.py	77.17% <0.00%> (+1.08%)	⬆️

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