Mayor Bill de Blasio has been talking to his inner circle and union allies about running for governor, and sources say he is growing increasingly confident he can win.“I fell out of my chair laughing — he is honestly thinking about it,” said a former senior adviser. “Because of all this Cuomo s–t, he is feeling bold.”Hizzoner played coy all week when asked if he was eyeing his embattled rival’s job. “The future will take care of itself,” when a reporter posed the question on Thursday.The public comments are not only intended to rile Gov. Cuomo — but behind closed doors, de Blasio is openly...…Mayor Bill de Blasio has been talking to his inner circle and union allies about running for governor, and sources say he is growing increasingly confident he can win.“I fell out of my chair laughing — he is honestly thinking about it,” said a former senior adviser. “Because of all this Cuomo s–t, he is feeling bold.”Hizzoner played coy all week when asked if he was eyeing his embattled rival’s job. “The future will take care of itself,” when a reporter posed the question on Thursday.The public comments are not only intended to rile Gov. Cuomo — but behind closed doors, de Blasio is openly...WW…