Just to clarify nomenclature, the pistol adopted in 1911 is the Model 1911, or M1911. The upgrade is the Model 1911A1 or M1911A1.
No, no .45 pistols were made specifically by or for the government after 1945. Some commercial 1911 type pistols, and other pistols, have been purchased "off the shelf" for special uses in recent years, but the official service pistol is the M9.
Jim