WASHINGTON — President Joe Biden signed a bill Thursday that will give around-the-clock security protection to the families of Supreme Court justices.The new law, which passed the House this week and the Senate last month, comes eight days after a man carrying a gun, knife and zip ties was arrested near Justice Brett Kavanaugh’s house after threatening to kill the justice.The bill calling for the expansion of security protections was approved unanimously by the Senate and passed shortly after the leak of a …