use Yosys 0.39

[openroad-robot]

asap7/ibex

Metric	Old	New	Type
finish__timing__setup__ws	-230.49	-351.24	Failing
finish__timing__wns_percent_delay	-11.34	-28.9	Failing

asap7/mock-alu

Metric	Old	New	Type
detailedroute__route__wirelength	66023	62749	Tighten
finish__timing__setup__ws	-649.04	-693.46	Failing

gf180/ibex

Metric	Old	New	Type
synth__design__instance__area__stdcell	739750.9	737573.0	Tighten
placeopt__design__instance__area	775591	757868	Tighten
placeopt__design__instance__count__stdcell	18839	16247	Tighten
cts__design__instance__count__setup_buffer	1638	1413	Tighten
cts__design__instance__count__hold_buffer	1638	1413	Tighten
detailedroute__route__wirelength	1571453	1484542	Tighten
finish__timing__setup__ws	-3.08	-3.85	Failing
finish__design__instance__area	851353	774188	Tighten
finish__timing__drv__setup_violation_count	819	706	Tighten

[eder-matheus]

@maliberty With this update, bp_single is finishing in 6 hours with this error message:
[ERROR] Current DRC number (--) is over the limit.

ca53 is timing out during drt due to fat vias. I intend to create a PR for the fat vias support in GRT tomorrow, so it should be safe to merge this Yosys update IMO.