patch 8.2.2758: Vim9: wrong line number for autoload function with wrong name

Problem:    Vim9: wrong line number for autoload function with wrong name.
Solution:   Set and restore SOURCING_LNUM. (closes #8100)
diff --git a/src/version.c b/src/version.c
index 3728f32..4e61210 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2758,
+/**/
     2757,
 /**/
     2756,