Saoirse Ronan and Jack Lowden have reportedly married in a secret ceremony in Scotland. The 30-year-old ‘Atonement’ star has been dating the ‘Slow Horses’ actor, 34, since 2018 after they worked together on historical drama ‘Mary Queen of Scots’ and now the Irish Independent newspaper reports the pair tired the knot in a low-key ceremony in Edinburgh earlier this month in front of just a “handful” of the couple’s closest friends and family who were all “sworn to secrecy”. The publication reports the wedding took place at the Edinburgh Registrar’s Office and was confirmed on the register of Sco…