Tuning designs for PDK 0.3 using 6T library

[openroad-ci]

Updated cva6, ibex, and jpeg designs to run on PDK 0.3 using 6T library.

The jpeg design using 8T was also modified to get to negative slack.

jpeg base

Metric	Old	New	Type
cts__timing__setup__ws	-0.01	-0.0432	Failing
cts__timing__setup__tns	-0.04	-29.2	Failing
cts__timing__hold__ws	-0.01	-0.0075	Tighten
cts__timing__hold__tns	-0.04	-0.03	Tighten
globalroute__timing__setup__ws	-0.0629	-0.0952	Failing
globalroute__timing__setup__tns	-35.7	-142.0	Failing
globalroute__timing__hold__ws	-0.01	-0.0075	Tighten
globalroute__timing__hold__tns	-0.04	-0.03	Tighten
finish__timing__setup__ws	-0.0629	-0.0952	Failing
finish__timing__setup__tns	-35.7	-142.0	Failing
finish__timing__hold__ws	-0.01	-0.0075	Tighten
finish__timing__hold__tns	-0.04	-0.03	Tighten

jpeg verific

Metric	Old	New	Type
cts__timing__setup__ws	-0.01	-0.0529	Failing
cts__timing__setup__tns	-0.04	-30.9	Failing
cts__timing__hold__ws	-0.01	-0.0075	Tighten
cts__timing__hold__tns	-0.04	-0.03	Tighten
globalroute__timing__setup__ws	-0.0649	-0.092	Failing
globalroute__timing__setup__tns	-39.0	-126.0	Failing
globalroute__timing__hold__ws	-0.01	-0.0075	Tighten
globalroute__timing__hold__tns	-0.04	-0.03	Tighten
finish__timing__setup__ws	-0.0649	-0.092	Failing
finish__timing__setup__tns	-39.0	-126.0	Failing
finish__timing__hold__ws	-0.01	-0.0075	Tighten
finish__timing__hold__tns	-0.04	-0.03	Tighten

[maliberty]

I'm going to hold this for #3834 to go in first

[jeffng-or]

I'm going to hold this for #3834 to go in first

Yup, no problem.