Open Electronic Tender Procedure For The Procurement Of The Reception Service For Foreign Citizens Requesting International Protection In Collective Centers With A Capacity Of 101 To 300 Places, Located In The Province Of Oristano For A Period Of 36 Months, Using The Criterion Of The Most Economically Advantageous Offer Pursuant To Art. 71 And 108 Of Legislative Decree 31.3.2023 N. 36.