qa/suites/rados/verify/validater/valgrind: increase op thread timeout

qa/suites/rados/verify/validater/valgrind: increase op thread timeout

Fixes: https://tracker.ceph.com/issues/62992
Signed-off-by: Matan Breizman <mbreizma@redhat.com>
(cherry picked from commit d580e2392f3ae9843967ceccae053b32f6b0f2c3)
Signed-off-by: Laura Flores <lflores@ibm.com>
Conflicts:
	qa/suites/rados/verify/validater/valgrind.yaml
        - Commit a86f75f6f57c62e46084285cc6071f0043adf8a9 increased
          "osd heartbeat grace", which was backported prior to this
          commit in squid. In main, however, this commit (the change
          to "osd op thread timeout") was made prior to the "osd heartbeat
          grace" change.