Updates for ConfigParser in python 3.12

SafeConfigParser has been deprecated since Python 3.2 and was removed
in Python 3.12 entirely.
Per the release notes [1] it is recommended to use the ConfigParser
class now.

Additionally, the readfp method has been removed in favor of read_file.

[1] - https://docs.python.org/3.12/whatsnew/3.12.html#configparser

versioneer.py

@@ -339,9 +339,9 @@ def get_config_from_root(root):
     # configparser.NoOptionError (if it lacks "VCS="). See the docstring at
     # the top of versioneer.py for instructions on writing your setup.cfg .
     setup_cfg = os.path.join(root, "setup.cfg")
-    parser = configparser.SafeConfigParser()
+    parser = configparser.ConfigParser()
     with open(setup_cfg, "r") as f:
-        parser.readfp(f)
+        parser.read_file(f)
     VCS = parser.get("versioneer", "VCS")  # mandatory
 
     def get(parser, name):