Tests: include cattrs and fastjsonschema in bundled modules test

These libs have landed for all platforms, so we can now test for them.

Pull Request: https://projects.blender.org/blender/blender/pulls/143710

tests/python/bl_bundled_modules.py

@@ -25,6 +25,8 @@ import ssl
 import urllib3
 import zlib
 import zstandard
+import cattrs
+import fastjsonschema
 
 # Dynamically loaded modules, to ensure they have satisfactory dependencies.
 import _blake2