increasing timeout for tests

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
         python: ["3.7", "3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 20
     steps:
       - uses: actions/checkout@v3
       - name: set up Python