test: fix `test/internet/test-inspector-help-page`
This fixes the test to use its own https.agent
instead of the default one.
It seems to be related to the default options change of the global agent.
Refs: https://github.com/nodejs/node/pull/43522 Refs: https://github.com/nodejs/node/actions/workflows/test-internet.yml
Signed-off-by: Daeyeon Jeong daeyeon.dev@gmail.com