Minor metrics updates for gf12/bp_single & tsmc56lp/gcd

gf12/bp_single:
 Updating failing rule globalroute__timing__setup__ws from -450.39 to -578.64.
 Tightening rule finish__timing__drv__max_slew_limit from -0.64 to -0.58.
 Tightening rule finish__timing__drv__hold_violation_count from 2144 to 2136.

tsmc56lp/gcd:
 Updating failing rule cts__design__instance__count__setup_buffer from 26 to 31.
 Tightening rule finish__timing__drv__setup_violation_count from 30 to 29.

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty