feat!: remove osx & windows platform

[erisu]

Platforms affected

osx, windows

Motivation and Context

Remove OSX and Windows platform.

Description

Since it was deprecated, this prepares the removal.

Testing

• n/a

Checklist

• [ ] I've run the tests to see all new and existing tests pass
• [ ] I added automated test coverage as appropriate for this change
• [ ] Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• [ ] If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• [x] I've updated the documentation if necessary
  • was already deprecated.

[codecov-commenter]

Codecov Report

Merging #896 (2e68b1f) into master (09e56c1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #896   +/-   ##
=======================================
  Coverage   88.27%   88.27%           
=======================================
  Files          46       46           
  Lines        2123     2123           
=======================================
  Hits         1874     1874           
  Misses        249      249           

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