Bump version: 1.2.1 → 1.2.2

.bumpversion.cfg

 [bumpversion]
-current_version = 1.2.1
+current_version = 1.2.2
 commit = true
 tag = true
 

grid5000/__version__.py

-__version__ = "1.2.1"
+__version__ = "1.2.2"