Log Message:
py-frozendict: update to 2.3.7.

2.3.6 distfile not available.

pkgsrc changes:
- fix test target
- simplify

upstream changes:

    Fixed a regression in sdist packages that made them not working
    in the previous release (by @sunpoet in #77)

    Added arm64 builds for all supported archs (Linux, Windows,
    Mac)