fixup! Fix string formatting of numbers outside int range

Revert back to using graal BiFunction

Author: Zach Olstein

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/runtime/formatting/StringFormatter.java

@@ -15,8 +15,9 @@
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.TypeError;
 import static com.oracle.graal.python.runtime.exception.PythonErrorType.ValueError;
 
+import com.oracle.graal.python.util.BiFunction;
+
 import java.math.BigInteger;
-import java.util.function.BiFunction;
 
 import com.oracle.graal.python.builtins.PythonBuiltinClassType;
 import com.oracle.graal.python.builtins.objects.PNone;