Pete Davidson’s latest scheme to revamp his Staten Island ferry boondoggle is dead in the water. A plan to dock the decommissioned ship-turned-party boat at a Manhattan pier for the blockbuster US 250 bash has officially sunk after the funnyman failed to secure the proper permits, The Post has learned. The city’s Economic Development Corp broke the news to Community Board 1 Thursday — after its members spent weeks raising numerous concerns about wedging the John F. Kennedy ferry at Pier 15 near