patch 8.2.2951: Vim9: cannot use heredoc for :python, :lua, etc.

Problem:    Vim9: cannot use heredoc in :def function for :python, :lua, etc.
Solution:   Concatenate the heredoc lines and pass them in the ISN_EXEC_SPLIT
            instruction.
diff --git a/src/version.c b/src/version.c
index 06340e3..f995518 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2951,
+/**/
     2950,
 /**/
     2949,