BATON ROUGE — The city-parish is proposing another increase in health insurance rates in 2027 as the Metro Council prepares to vote on the changes Wednesday.The proposal comes as 80-year-old Herbert "Bill" Billingsley worries about rising health care costs, especially under Mayor-President Sid Edwards' plan to give raises to all police officers and city-parish employees.Last year, Billingsley and his wife paid $274 a month for HMO coverage and t…