change KITTYCAD_API_TOKEN to ZOO_TOKEN

Author: adamchalmers

.github/workflows/CI.yml

@@ -29,7 +29,7 @@ jobs:
         cargo build
     - name: Run tester
       env:
-        KITTYCAD_API_TOKEN: ${{secrets.KITTYCAD_API_TOKEN}}
+        ZOO_TOKEN: ${{secrets.KITTYCAD_API_TOKEN}}
       run: |
         ./kcl-book-tester/target/debug/kcl-book-tester . all