patch 9.0.0424: gitattributes files are not recognized

Problem:    gitattributes files are not recognized.
Solution:   Add patterns to match gitattributes files. (closes #11085)
diff --git a/src/version.c b/src/version.c
index 445ac6d..24c99fd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    424,
+/**/
     423,
 /**/
     422,