[py]: Update changelog for 4.3

Author: symonk

py/CHANGES

@@ -1,4 +1,12 @@
-Selenum 4.2.0
+Selenium 4.3.0
+* Deprecated find_element_by_* and find_elements_by_* are now removed (#10712)
+* Deprecated Opera support has been removed (#10630)
+* Fully upgraded from python 2x to 3.7 syntax and features (#10647)
+* Added a devtools version fallback mechanism to look for an older version when mismatch occurs (#10749)
+* Better support for co-operative multi inheritance by utilising super() throughout
+* Improved type hints throughout
+
+Selenium 4.2.0
 * Fix bug preventing Firefox from setting accept_insecure_certs to False (#10442)
 * Deprecated opera classes as not w3c compatible (#10379)
 * Fix SecurityError: Invalid Domain problem (#10653)