Fixes Python print()s not showing up in wrangler dev.

[dom96]

It's not trivial to test this in workerd, but I will follow up with a test in workers-sdk.

Test Plan

bazel run @workerd//src/workerd/server/tests/python:hello_development@

Before

workerd/server/server.c++:4470: debug: [ TEST ] python-hello
Loading hashlib, lzma, pydecimal, pydoc-data, sqlite3, ssl
Loaded hashlib, lzma, pydecimal, pydoc-data, sqlite3, ssl
workerd/io/worker.c++:1871: info: console.log(); message() = ["Does this work?"]
Does this work?

After

workerd/server/server.c++:4470: debug: [ TEST ] python-hello
Loading hashlib, lzma, pydecimal, pydoc-data, sqlite3, ssl
Loaded hashlib, lzma, pydecimal, pydoc-data, sqlite3, ssl
Does this work?
Does this work?
workerd/server/server.c++:4478: debug: [ PASS ] python-hello

[hoodmane]

These changes are fine but it would be nice to try to actually test this in workerd if possible.