Mark Robert Collins as inactive per committer's request

Author: ambv

core-developers/developers.csv

@@ -52,7 +52,7 @@ Xavier de Gaye,xdegaye,2016-06-03,2018-01-25,Privileges relinquished on 2018-01-
 Davin Potts,applio,2016-03-06,,
 Martin Panter,vadmium,2015-08-10,2020-11-26,
 Paul Moore,pfmoore,2015-03-15,,
-Robert Collins,rbtcollins,2014-10-16,,To work on unittest
+Robert Collins,rbtcollins,2014-10-16,2021-11-30,To work on unittest; privileges relinquished on 2021-11-30
 Berker Peksağ,berkerpeksag,2014-06-26,,
 Steve Dower,zooba,2014-05-10,,
 Kushal Das,kushaldas,2014-04-14,,