patch 8.2.3558: Vim9: asserting the wrong variable

Problem:    Vim9: asserting the wrong variable.
Solution:   Don't use Foo, use Goo.
diff --git a/src/testdir/test_vim9_script.vim b/src/testdir/test_vim9_script.vim
index ae58a0b..7e174df 100644
--- a/src/testdir/test_vim9_script.vim
+++ b/src/testdir/test_vim9_script.vim
@@ -1495,7 +1495,7 @@
 
       def DoTest()
         const Goo = G()
-        assert_equal(42, Foo)
+        assert_equal(42, Goo)
       enddef
       DoTest()
   END
diff --git a/src/version.c b/src/version.c
index ea396cd..53ceef0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3558,
+/**/
     3557,
 /**/
     3556,