ubuntu-release-upgrader: fixed pep440 compatibility; updated some string replacements

helpers/DATA/ubuntu-release-upgrader/pep440.patch

@@ -0,0 +1,18 @@
+--- a/setup.py	2024-08-24 23:17:50.141778711 -0400
++++ b/setup.py	2024-08-24 23:11:05.728064936 -0400
+@@ -1,6 +1,7 @@
+ #!/usr/bin/env python3
+ 
+ import glob
++import re
+ 
+ from distutils.core import setup
+ from subprocess import check_output
+@@ -15,6 +16,7 @@
+         # PEP 440 uses '!' for the epoch separator:
+         #   https://peps.python.org/pep-0440/#version-epochs
+         version = value.strip().replace(':','!')
++        version = re.sub("([a-zA-Z])", r"+\1", version, count=1)
+         break
+ else:
+     raise RuntimeError('No version found in debian/changelog')