bump version number to v2.9

Signed-off-by: Yann Sionneau <yann@sionneau.net>

Author: fallen

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "Pytition"
-version = "2.8.1"
+version = "2.9"
 description = "Django app for self-hosted privacy-friendly online petitions"
 authors = [
     {name = "Yann Sionneau", email = "yann@sionneau.net"},