textproc/py-python-pptx: Update to 0.6.22

ChangeLog: https://github.com/scanny/python-pptx/blob/v0.6.22/HISTORY.rst

• Add imgW, imgH params to shapes.add_ole_object()
• fix: _Relationships.items() raises
• fix: quote in autoshape name must be escaped
• fix: update Python 3.x support in docs
• fix: setup's license should be short string
• fix: AttributeError: module 'collections' has no attribute 'abc' (Windows Python 3.10+)

PR: 273603