Bump version to 4.22.1

Author: rmk135

docs/main/changelog.rst

@@ -7,6 +7,11 @@ that were made in every particular version.
 From version 0.7.6 *Dependency Injector* framework strictly 
 follows `Semantic versioning`_
 
+4.22.1
+------
+- Pin ``sphinx`` version to hotfix docs build.
+- Fix a typo in docs.
+
 4.22.0
 ------
 - Add method ``container.check_dependencies()`` to check if all container dependencies

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.22.0'
+__version__ = '4.22.1'
 """Version number.
 
 :type: str