Add permissions to github action

Elevated permissions needed to be able to create PRs.

Author: jvulgan

.github/workflows/get_new_package_versions.yml

@@ -1,5 +1,10 @@
 name: Get New Package Versions
 
+# needed for creating PRs
+permissions:
+  contents: write
+  pull-requests: write
+
 on:
   # TODO: replace with reasonable cron schedule
   #schedule: