[fbsync] disable pyav==9.1.1 on windows (#5724)

Summary: Co-authored-by: Vasilis Vryniotis <[email protected]>

Reviewed By: NicolasHug

Differential Revision: D35393167

fbshipit-source-id: 2e8de445df27a3d618c981b2318738b097db4dd1

Author: datumbox

.circleci/unittest/windows/scripts/environment.yml

@@ -14,6 +14,6 @@ dependencies:
     - future
     - pillow >=5.3.0, !=8.3.*
     - scipy
-    - av
+    - av != 9.1.1
     - dataclasses
     - h5py