patch 9.0.0842: Unicode range for Apple SF symbols is outdated

Problem:    Unicode range for Apple SF symbols is outdated.
Solution:   Update to SF Symbols 4. (Yee Cheng Chin, closes #11474)
diff --git a/src/version.c b/src/version.c
index 0e59a78..d46aebb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    842,
+/**/
     841,
 /**/
     840,