chore: replace references to the default branch

[malept]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).

Summarize your changes:

The default branch has changed from master to main, update references as appropriate (electron/electron has also changed, so change those references as well).

[codecov]

Codecov Report

Merging #1262 (5b776e0) into main (ebcbd43) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #1262   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          716       716           
=========================================
  Hits           716       716           

Impacted Files	Coverage Δ
src/infer.js	100.00% <ø> (ø)

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