Bump version to 4.3.0

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`_
 
+4.3.0
+-----
+- Implement per-function execution scope for ``Resource`` provider in tandem
+ with ``wiring.Closing``.
+
 4.2.0
 -----
 - Add support of Python 3.9.

src/dependency_injector/__init__.py

@@ -1,6 +1,6 @@
 """Top-level package."""
 
-__version__ = '4.2.0'
+__version__ = '4.3.0'
 """Version number.
 
 :type: str