patch 8.2.3178: Vim9: the file name of an :import cannot be an expression

Problem:    Vim9: the file name of an :import cannot be an expression.
Solution:   Accept an expression that results in a string.  Do not support
            :import in a function.
diff --git a/src/version.c b/src/version.c
index 0eb4b44..6f7864a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3178,
+/**/
     3177,
 /**/
     3176,