Bump to 2.13.0.dev0

Author: blink1073

jupyter_server/_version.py

@@ -6,7 +6,7 @@
 from typing import List
 
 # Version string must appear intact for automatic versioning
-__version__ = "2.12.5"
+__version__ = "2.13.0.dev0"
 
 # Build up version_info tuple for backwards compatibility
 pattern = r"(?P<major>\d+).(?P<minor>\d+).(?P<patch>\d+)(?P<rest>.*)"