fix: use tag name instead of version when resolving GitHub files

[wardellbagby]

Modify the GitHubProvider to provide the tag name of the latest
release as apart of its UpdateInfo (which is now encapsulated in the
GithubUpdateInfo interface) so that it uses that same tag name later
when it resolves the files to download.

fix /issues/6076

[changeset-bot]

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Latest commit: 069facb

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[mmaietta]

Nice work! Thanks for contributing!

[mmaietta]

Please double-check the GitHub-related tests when you can

 FAIL  src/updater/nsisUpdaterTest.ts
  ✕ downgrade (disallowed, beta) (254 ms)
  ✕ file url github (261 ms)
  ✕ file url github pre-release and fullChangelog (38 ms)

    HttpError: 404 Not Found
    "method: GET url: https://github.com/develar/__test_nsis_release/releases/download/1.5.2-beta.3/latest.yml\n\

[wardellbagby]

Kinda took a guess as to whether y'all were rebase or merge folks and just rebased. Hope you don't mind!

[wardellbagby]

Oops, missed some tests. Fixing...

[wardellbagby]

Sorry for the fix-test-push loop here; I can't run all of the tests locally. 😭