Whenever the Governor shall determine that the conditions of suspension of the contributions required by this chapter, as hereinbefore defined, exist by reason of any repeal, amendment, suspension, or declared invalidity of the federal Social Security Act or the Federal Unemployment Tax Act, he or she shall so declare by proclamation and thereupon the suspension hereinbefore provided shall become effective and continue for a period of two years from said date, subject to such legislative amendment, modification, or repeal as may be enacted within said period.