Changed Pyhton 3.6 tests to 3.9

cb6fd028 · Oscar Gustafsson · Brandon T. Willard · 00aac3f9 · cb6fd028
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -66,7 +66,7 @@ jobs:
    strategy:
      fail-fast: true
      matrix:
-        python-version: ["3.6", "3.7"]
+        python-version: ["3.7", "3.9"]
        fast-compile: [0]
        float32: [0]
        part: