bump default year to 2024; CRAN prep

Author: walkerke

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: tigris
 Type: Package
 Title: Load Census TIGER/Line Shapefiles
-Version: 2.2.0.9000
+Version: 2.2.1
 Date: 2025-04-15
 Authors@R: c(
       person(given="Kyle", family="Walker", email="[email protected]", role=c("aut", "cre")),