Bump default R version to 4.2

Been out for a bit now

Author: yuvipanda

repo2docker/buildpacks/r.py

@@ -75,7 +75,7 @@ def r_version(self):
 
         # the default if nothing is specified
         # Use full version is needed here, so it a valid semver
-        r_version = version_map["4.1"]
+        r_version = version_map["4.2"]
 
         if not hasattr(self, "_r_version"):
             parts = self.runtime.split("-")

tests/r/simple/verify

@@ -1,7 +1,7 @@
 #!/usr/bin/env Rscript
 library('testthat')
 
-# Fail if version is not 4.1
-if (!(version$major == "4" && as.double(version$minor) >= 1 && as.double(version$minor) < 2)) {
+# Fail if version is not 4.2
+if (!(version$major == "4" && as.double(version$minor) >= 2 && as.double(version$minor) < 3)) {
   quit("yes", 1)
 }