patch 8.2.1953: Vim9: extra "unknown" error after other error

Problem:    Vim9: extra "unknown" error after other error.
Solution:   Restore did_emsg count after EXEC instruction. (closes #7254)
            Improve error message from assert_fails()
diff --git a/src/version.c b/src/version.c
index 98a3ab1..a55d2f3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1953,
+/**/
     1952,
 /**/
     1951,