Python 3.12 is more strict with string escaping, \ is interpreted as a unicode char escaping, so many regex fail.

Reproducible: Always

Steps to Reproduce:
1. Install F40
2. Run itstool
3.
Actual Results:  
/usr/bin/itstool:236: SyntaxWarning: invalid escape sequence '\s'
  if re.sub('\s+', ' ', text).strip() != '':
/usr/bin/itstool:334: SyntaxWarning: invalid escape sequence '\s'
  message = re.sub('\s+', ' ', message).strip()
/usr/bin/itstool:472: SyntaxWarning: invalid escape sequence '\s'
  return re.sub('\s+', ' ', self.locnote).strip()
/usr/bin/itstool:474: SyntaxWarning: invalid escape sequence '\s'
  return '(itstool) link: ' + re.sub('\s+', ' ', self.locnoteref).strip()
/usr/bin/itstool:905: SyntaxWarning: invalid escape sequence '\<'
  regex = re.compile('(.*) \<(.*)\>, (.*)')
/usr/bin/itstool:940: SyntaxWarning: invalid escape sequence '\s'
  if re.sub('\s+', '', prevtext) == '':
/usr/bin/itstool:1484: SyntaxWarning: invalid escape sequence '\.'
  _locale_pattern = re.compile('([a-zA-Z0-9-]+)(_[A-Za-z0-9]+)?(@[A-Za-z0-9]+)?(\.[A-Za-z0-9]+)?')
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"POT-Creation-Date: 2023-09-17 16:13+0200\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL>\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"


Expected Results:  
No errors

Actually some packages like ardour 7 cannot verify itdtool version when building, so they fail