Release v4.4.0 (#3898)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Arvind Bhamidipati <arvind.bhamidipati@salesforce.com>
Co-authored-by: James Estevez <jestevez@salesforce.com>

Author: 3 people

cumulusci/__about__.py

@@ -1 +1 @@
-__version__ = "4.3.0.dev0"
+__version__ = "4.4.0"