ci: Update timeout for phan test

[anomiex]

Proposed changes:

The test is taking longer now, probably since we added the run against the previous WP version's stubs in #36530. Update the timeout for runs at the edge of the curve.

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

None worth linking

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• 🤷

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[tbradsha]

It pains me that we have to increase the time things take, but it should work.