tests: Bump the refcount timeout in gdbus-threading

Merged Philip Withnall requested to merge pwithnall/glib:1515-gdbus-threading-timeout into master

Currently the test waits for 1s before deciding that a refcount has been leaked. But slow test machines might take longer than that between scheduling different threads to sort out the refcount, so increase the timeout.

Signed-off-by: Philip Withnall withnall@endlessm.com

Helps: #1515 (closed)

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