(Bloomberg) — US banks have been locked in a grueling battle for deposits they once took for granted. And one of the toughest combatants in the fight is the federal government.Most Read from BloombergYields on one-year US Treasuries broke back above 5% Thursday, and shorter ones were already above 5.2%. That’s on par with or better than the certificates of deposits offered by banks, which averaged 4.38% in the first two weeks of May, according to Morgan Stanley analysts, and problematic for p …