Don't run actions twice on pull requests.

HexDecimal · HexDecimal · commit 33ead26ab6bc · 2022-10-30T11:31:29.000-07:00
diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
@@ -6,6 +6,7 @@ name: Package
 on:
   push:
   pull_request:
+    types: [opened, reopened]
 
 defaults:
   run:
