patch 8.2.0068: crash when using Python 3 with "utf32" encoding

Problem:    Crash when using Python 3 with "utf32" encoding. (Dominique Pelle)
Solution:   Use "utf-8" whenever enc_utf8 is set. (closes #5423)
diff --git a/src/version.c b/src/version.c
index 432ae4d..1c7dbba 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    68,
+/**/
     67,
 /**/
     66,