textproc/py-towncrier: Clean up Makefile

• Clean up BUILD_DEPENDS [1]
• Fix and sort RUN_DEPENDS [2]
• Update USES=python [3]
• Add NO_ARCH
• Bump PORTREVISION for dependency change [3]

Approved by: portmgr (blanket)
With hat: python
Reference: https://github.com/twisted/towncrier/blob/22.12.0/setup.py#L6 [1]

		https://github.com/twisted/towncrier/blob/22.12.0/setup.py#L47 [2]
		https://github.com/twisted/towncrier/blob/22.12.0/setup.py#L40 [3]