release v1.2.3

fix: UnicodeDecodeError in windows

pywebio/__version__.py

@@ -1,8 +1,8 @@
 __package__ = 'pywebio'
 __description__ = 'Write interactive web app in script way.'
 __url__ = 'https://pywebio.readthedocs.io'
-__version__ = "1.2.2"
-__version_info__ = (1, 2, 2, 0)
+__version__ = "1.2.3"
+__version_info__ = (1, 2, 3, 0)
 __author__ = 'WangWeimin'
 __author_email__ = 'wang0.618@qq.com'
 __license__ = 'MIT'