Provider=SQLNCLI11;Server=myServer;Database=myDB;MARS Connection=True; Microsoft has clearly stated that SQL Server Native Client (any version, including 2012) will not receive new features, security fixes, or support for newer SQL Server versions (2014, 2016, 2017, 2019, 2022).
Modern alternatives:
Provider=SQLNCLI11;Server=myServer\instance;Database=myDB;Trusted_Connection=yes; Enabling (Multiple Active Result Sets): microsoft sql server native client 2012