[3.13] gh-132912: Set 15 min timeout on GHA Hypothesis CI (GH-132914) (#132937)

gh-132912: Set 15 min timeout on GHA Hypothesis CI (GH-132914)
(cherry picked from commit eb2e430b88afa93e7bfc05f4346e8336c2c31b48)

Co-authored-by: Victor Stinner <vstinner@python.org>