textproc/itstool: Import upstream patch and pull request

• Fix Python 3.12+ warning about regular expressions [1]
• Replace py-libxml2-python with py-lxml [2]
• Bump PORTREVISION for package change

PR: 287143
Reported by: diizzy
Obtained from: https://github.com/itstool/itstool/commit/32c7d07664dc37765100285d1202d488cd6a27e8 [1]

		https://github.com/itstool/itstool/pull/57 [2]