fixup: updated test262.properties to JDK 1.8

Unfortunately, some of the tests pass only on higher version of the JDK,
because they have updated unicode support. On JDK 1.8 we get a lot of
failures that we aren't getting on Java 11 or 17.

testsrc/test262.properties

@@ -5027,7 +5027,41 @@ language/global-code 29/41 (70.73%)
 
 language/identifier-resolution 0/13 (0.0%)
 
-language/identifiers 4/188 (2.13%)
+language/identifiers 38/188 (20.21%)
+    other_id_continue.js
+    other_id_continue-escaped.js
+    other_id_start.js
+    other_id_start-escaped.js
+    part-unicode-10.0.0.js
+    part-unicode-10.0.0-escaped.js
+    part-unicode-11.0.0.js
+    part-unicode-11.0.0-escaped.js
+    part-unicode-12.0.0.js
+    part-unicode-12.0.0-escaped.js
+    part-unicode-13.0.0.js
+    part-unicode-13.0.0-escaped.js
+    part-unicode-5.2.0.js
+    part-unicode-5.2.0-escaped.js
+    part-unicode-7.0.0.js
+    part-unicode-7.0.0-escaped.js
+    part-unicode-8.0.0.js
+    part-unicode-8.0.0-escaped.js
+    part-unicode-9.0.0.js
+    part-unicode-9.0.0-escaped.js
+    start-unicode-10.0.0.js
+    start-unicode-10.0.0-escaped.js
+    start-unicode-11.0.0.js
+    start-unicode-11.0.0-escaped.js
+    start-unicode-12.0.0.js
+    start-unicode-12.0.0-escaped.js
+    start-unicode-13.0.0.js
+    start-unicode-13.0.0-escaped.js
+    start-unicode-7.0.0.js
+    start-unicode-7.0.0-escaped.js
+    start-unicode-8.0.0.js
+    start-unicode-8.0.0-escaped.js
+    start-unicode-9.0.0.js
+    start-unicode-9.0.0-escaped.js
     vertical-tilde-continue.js
     vertical-tilde-continue-escaped.js
     vertical-tilde-start.js