patch 8.2.3865: Vim9: compiler complains about using "try" as a struct member

Problem:    Vim9: compiler complains about using "try" as a struct member.
Solution:   Rename "try" to "tryref".
diff --git a/src/vim9.h b/src/vim9.h
index 8a243ba..a79ffb5 100644
--- a/src/vim9.h
+++ b/src/vim9.h
@@ -112,7 +112,7 @@
     // loop
     ISN_FOR,	    // get next item from a list, uses isn_arg.forloop
 
-    ISN_TRY,	    // add entry to ec_trystack, uses isn_arg.try
+    ISN_TRY,	    // add entry to ec_trystack, uses isn_arg.tryref
     ISN_THROW,	    // pop value of stack, store in v:exception
     ISN_PUSHEXC,    // push v:exception
     ISN_CATCH,	    // drop v:exception
@@ -429,7 +429,7 @@
 	jump_T		    jump;
 	jumparg_T	    jumparg;
 	forloop_T	    forloop;
-	try_T		    try;
+	try_T		    tryref;
 	trycont_T	    trycont;
 	cbfunc_T	    bfunc;
 	cdfunc_T	    dfunc;