base64: Update package version.

This commit updates the version number of the `base64` package, bumping
up the minor version.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

Author: agatti

python-stdlib/base64/manifest.py

@@ -1,4 +1,4 @@
-metadata(version="3.3.6")
+metadata(version="3.3.7")
 
 require("binascii")