upkeep: bump r2dii version in helper-skip_if_r2dii_data_outdated.R

The (brittle) snapshot tests are currently failing when run against the CRAN published `r2dii.data v0.5.0`. They only pass against the dev version of the package.

This PR bumps the function that skips snapshot tests with old `r2dii.data`. 

Another indication that we should prioritize working on #392

Relates to RMI-PACTA/r2dii.data#374
Relates to #473

tests/testthat/helper-skip_if_r2dii_data_outdated.R

@@ -1,6 +1,6 @@
 skip_if_r2dii_data_outdated <- function() {
   skip_if(
-    packageVersion("r2dii.data") <= "0.4.1",
+    packageVersion("r2dii.data") <= "0.5.0",
     "We expect different output"
   )
 }