feat: add support for win32/arm64 official builds

[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).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

Official win32/arm64 builds were added in Electron 6.0.8.

Fixes #1052.

[codecov-io]

Codecov Report

Merging #1053 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1053   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files          14      14           
  Lines         695     695           
======================================
  Hits          695     695

Impacted Files	Coverage Δ
src/targets.js	100% <100%> (ø)	⬆️

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[malept]

I did a quick smoketest - rcedit doesn't crash when operating on the win32/arm64 binary.