fix(maker-dmg): add the arch to the default dmg name

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

Summarize your changes:

As reported in Discord, publishing both arm64 and x64 DMGs are by default difficult because it's named the same despite being built for different architectures. This adds the target arch to the default DMG basename.

[malept]

This isn't directly related. I just needed an easy way to run just the DMG maker's tests.

[codecov]

Codecov Report

Merging #2431 (f61c44c) into master (4a992b7) will decrease coverage by 2.34%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2431      +/-   ##
==========================================
- Coverage   75.08%   72.73%   -2.35%     
==========================================
  Files          91       91              
  Lines        2348     2344       -4     
  Branches      440      440              
==========================================
- Hits         1763     1705      -58     
+ Misses        476      473       -3     
- Partials      109      166      +57     

Impacted Files	Coverage Δ
packages/maker/dmg/src/MakerDMG.ts	100.00% <100.00%> (ø)
packages/api/core/src/api/publish.ts	69.73% <0.00%> (-22.37%)	⬇️
packages/api/core/src/api/start.ts	65.43% <0.00%> (-22.23%)	⬇️
packages/api/core/src/api/install.ts	78.20% <0.00%> (-16.67%)	⬇️
packages/api/core/src/util/rebuild.ts	92.85% <0.00%> (-7.15%)	⬇️
packages/api/core/src/api/make.ts	81.72% <0.00%> (-6.58%)	⬇️
packages/api/core/src/api/init.ts	92.68% <0.00%> (-4.88%)	⬇️
packages/api/core/src/util/upgrade-forge-config.ts	96.42% <0.00%> (+1.69%)	⬆️
packages/installer/darwin/src/InstallerDarwin.ts	33.33% <0.00%> (+1.75%)	⬆️
packages/maker/base/src/Maker.ts	77.77% <0.00%> (+2.10%)	⬆️

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