Fix a snapshot test for older R

Author: gaborcsardi

tests/testthat/_snaps/old-r/inline-2.md

@@ -4,8 +4,8 @@
       cli_text("xx {__cannot-parse-this__} yy")
     Condition
       Error:
-      ! Could not parse cli `{}` expression: `__cannot-parse-th...`.
-      Caused by error:
+      ! ! Could not parse cli `{}` expression: `__cannot-parse-th...`.
+      Caused by error in `parse(text = code, keep.source = FALSE)`:
       ! <text>:1:1: unexpected input
       1: _
           ^