patch 8.2.3873: go.mod files are not recognized

Problem:    go.mod files are not recognized.
Solution:   Check for the file name. (closes #9380)
diff --git a/src/version.c b/src/version.c
index 7a1fd69..53d3b57 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3873,
+/**/
     3872,
 /**/
     3871,