Bump version to 3.12.2

docs/main/changelog.rst

@@ -7,8 +7,8 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
-Development version
--------------------
+3.12.2
+------
 - Apply code style fixes to "services_v2" example miniapp.
 
 3.12.1

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Dependency injector top-level package."""
 
-__version__ = '3.12.1'
+__version__ = '3.12.2'
 """Version number that follows semantic versioning.
 
 :type: str