patch 8.2.1873: Vim9: missing white space when using <f-args>

Problem:    Vim9: missing white space when using <f-args>.
Solution:   Add spaces. (Christian J. Robinson)
diff --git a/src/version.c b/src/version.c
index dd34356..08da992 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1873,
+/**/
     1872,
 /**/
     1871,