patch 9.0.0808: jsonnet filetype detection has a typo

Problem:    jsonnet filetype detection has a typo.
Solution:   Change "libjsonnet" to "libsonnet". (Maxime Brunet, closes #11412)
diff --git a/src/version.c b/src/version.c
index 6456028..21ff6c2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    808,
+/**/
     807,
 /**/
     806,