discoverd/health: Increase timeout in tests.
discoverd/health: Increase timeout in tests.

"connection refused" behavior isn't the result of the timeout path; hitting the timeout results in "request canceled while waiting for connection".  Thus, this timeout should be longer.

Signed-off-by: Eric Myhre <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@flynn.io>

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