Mark some parser translator tests as being known failures

Without a change from `parser`, this is impossible to correctly handle.

Author: Earlopain

test/prism/ruby/parser_test.rb

@@ -72,15 +72,19 @@ class ParserTest < TestCase
 
       # Contains an escaped multibyte character. This is supposed to drop to backslash
       "seattlerb/regexp_escape_extended.txt",
+
+      # https://github.com/whitequark/parser/issues/1020
+      # These contain consecutive \r characters. Prism only receives the already modified
+      # source buffer but must know the original code to parse it correctly.
+      "seattlerb/heredoc_with_extra_carriage_returns_windows.txt",
+      "seattlerb/heredoc_with_only_carriage_returns_windows.txt",
+      "seattlerb/heredoc_with_only_carriage_returns.txt",
     ]
 
     # These files are either failing to parse or failing to translate, so we'll
     # skip them for now.
     skip_all = skip_incorrect | [
       "unescaping.txt",
-      "seattlerb/heredoc_with_extra_carriage_returns_windows.txt",
-      "seattlerb/heredoc_with_only_carriage_returns_windows.txt",
-      "seattlerb/heredoc_with_only_carriage_returns.txt",
       "seattlerb/pctW_lineno.txt",
       "seattlerb/regexp_esc_C_slash.txt",
       "unparser/corpus/literal/literal.txt",