All provisions contained in any of the following laws which prescribe or limit the interest rate or rates to be borne by bonds are repealed to the extent the same are in conflict with this article and to the extent necessary to effect the purpose of this article by exempting any bonds issued by a municipality from all laws of the state governing usury or prescribing or limiting interest rates to be borne by bonds:(1) Article 3 of this chapter, the 'Revenue Bond Law';(2) Article 4 of Chapter 7 of Title 31, the 'Hospital Authorities Law';(3) Article 1 of Chapter 3 of Title 8, the 'Housing Authorities Law';(4) Chapter 62 of this title, the 'Development Authorities Law'; and(5) Article 3 of Chapter 3 of Title 46, pertaining to the Municipal Electric Authority of Georgia.