fix QChemErrorHandler file renaming on Windows: os.rename -> os.replace

os.rename(self.input_file, self.input_file + ".last")
E       FileExistsError: [WinError 183] Cannot create a file when that file already exists: 'mol.qin' -> 'mol.qin.last'

custodian/qchem/handlers.py

@@ -380,6 +380,6 @@ def correct(self):
         ) and str(self.qcinp.geom_opt["initial_hessian"]).lower() == "read":
             del self.qcinp.geom_opt["initial_hessian"]
             actions.append({"initial_hessian": "deleted"})
-        os.rename(self.input_file, self.input_file + ".last")
+        os.replace(self.input_file, f"{self.input_file}.last")
         self.qcinp.write_file(self.input_file)
         return {"errors": self.errors, "warnings": self.warnings, "actions": actions}