Any action heretofore taken and approved by a majority vote of the board of directors of any water, sewer, or fire protection authority, and found and determined to be true by the governing body of each county in which any part of the said authority’s then existing service area lies, providing for an amendment to the authority’s certificate of incorporation increasing the number of members of said authority’s board of directors, is hereby authorized, ratified, and confirmed regardless of any defects, mistakes, errors, or ambiguities in the authorization thereof or in the provisions of law respecting amendments to certificates of incorporation of water, sewer, and fire protection authorities.