devel/py-setuptools_scm: Update to 3.3.3

• Update WWW (remove superfluous trailing slash)

Changelog since 3.1.0:

• Add eggs for python3.7 and 3.8 to the deploy
• Fix python3.8 support and add builds for up to python3.8
• Use a specific fallback root when calling fallbacks. Remove old hack that resets the root when fallback entrypoints are present.
• Add fallback_version option, which sets the version to be used when everything else fails.
• Add option git_describe_command to allow the user to control the way that git describe is called.

https://github.com/pypa/setuptools_scm/blob/v3.3.3/CHANGELOG.rst

PR: 238145
Submitted by: sunpoet