Run core tests in Safari. Partially addresses https://github.com/pyodide/pyodide/issues/989

It runs, but there are several test failures, I'll open separate issues about those.
blank_issues_enabled: true
contact_links:
  - name: Ask a Question
    url: https://github.com/pyodide/pyodide/discussions
    about: Ask and answer Pyodide related questions
  - name: 💬 Gitter
    url: https://gitter.im/pyodide/community
    about: Chat with Pyodide community

blank_issues_enabled: true
contact_links:
  - name: Ask a Question
    url: https://github.com/pyodide/pyodide/discussions
    about: Ask and answer Pyodide related questions
  - name: 💬 Gitter
    url: https://gitter.im/pyodide/community
    about: Chat with Pyodide community
