Tighten sky130hs gcd

[jeffng-or]

Tightened up sky130hs gcd after review. Reduced clock period and increased utilization, so rules need to be updated. Partially replaces #3641.

Metric	Old	New	Type
placeopt__design__instance__area	5134	6702	Failing
placeopt__design__instance__count__stdcell	622	741	Failing
cts__design__instance__count__setup_buffer	54	75	Failing
cts__timing__setup__ws	-0.095	-0.45	Failing
cts__timing__setup__tns	-0.38	-13.2	Failing
cts__timing__hold__ws	-0.095	-0.07	Tighten
cts__timing__hold__tns	-0.38	-0.28	Tighten
globalroute__timing__setup__ws	-0.095	-0.635	Failing
globalroute__timing__setup__tns	-0.38	-19.1	Failing
globalroute__timing__hold__ws	-0.095	-0.07	Tighten
globalroute__timing__hold__tns	-0.38	-0.28	Tighten
detailedroute__route__wirelength	10120	15082	Failing
detailedroute__timing__setup__ws	-0.095	-0.341	Failing
detailedroute__timing__setup__tns	-0.38	-7.52	Failing
detailedroute__timing__hold__ws	-0.095	-0.07	Tighten
detailedroute__timing__hold__tns	-0.38	-0.28	Tighten
finish__timing__setup__ws	-0.095	-0.552	Failing
finish__timing__setup__tns	-0.38	-15.2	Failing
finish__timing__hold__ws	-0.095	-0.07	Tighten
finish__timing__hold__tns	-0.38	-0.28	Tighten
finish__design__instance__area	5389	8200	Failing