bump dependency on R to 4.1 because of native pipe in the code

Author: e-kotov

DESCRIPTION

@@ -26,7 +26,7 @@ URL: https://rOpenSpain.github.io/spanishoddata/,
     https://github.com/rOpenSpain/spanishoddata
 BugReports: https://github.com/rOpenSpain/spanishoddata/issues
 Depends:
-    R (>= 3.5.0)
+    R (>= 4.1.0)
 Imports: 
     checkmate,
     curl (>= 5.0.0),