Bump version to 4.20.4 for the final deprecation release

The v4.20.3 tag and release already exist (March 2025) but their PyPI
publish failed, leaving PyPI at 4.20.2. Releasing the deprecation
notice as 4.20.4 avoids rewriting the existing tag.

Author: Eduardo Aguad

src/masonite/__init__.py

@@ -1,6 +1,6 @@
 import warnings
 
-__version__ = "4.20.3"
+__version__ = "4.20.4"
 
 warnings.warn(
     "The 'masonite' package is unmaintained and will receive no further updates. "