Update main.yaml

Author: dcherian

.github/workflows/main.yaml

@@ -23,7 +23,7 @@ jobs:
         with:
           path: _build
           # NOTE: change key to "jupyterbook-DATE" to force rebuilding cache
-          key: jupyterbook-20221106
+          key: jupyterbook-20220707
 
       - uses: ./.github/actions/setupconda