Switch from long-deprecated SafeConfigParser to ConfigParser

fluffyrequested to merge
fluffy-critter/feed2toot:fix-python-3.12 into master

Python 3.12 finally removed configparser.SafeConfigParser, which has just been an alias for configparser.ConfigParser for quite some time (and SafeConfigParser itself was deprecated way back in Python 3.2).

This fixes #87

Edited by fluffy

Merge request reports