Update version for the 2.3.0 release candidate
diff --git a/src/buildstream_plugins/__init__.py b/src/buildstream_plugins/__init__.py
index efcc92d..baef252 100644
--- a/src/buildstream_plugins/__init__.py
+++ b/src/buildstream_plugins/__init__.py
@@ -15,4 +15,4 @@
 #
 # Remember to adjust this version number before tagging releases
 #
-__version__ = "2.2.0"
+__version__ = "2.3.0.dev1"