default_insert not handled

[JustinAzoff]

https://github.com/zeek/zeek/blob/ba91de59b0b42126c2603eac9a27aa7cdc5aea75/NEWS#L645

https://docs.zeek.org/en/master/script-reference/attributes.html#default-insert

Being the same as &default I think we need to do

diff --git a/grammar.js b/grammar.js
index ca43b76..fdbbe9c 100644
--- a/grammar.js
+++ b/grammar.js
@@ -261,6 +261,7 @@ module.exports = grammar({
           seq("&broker_store", "=", $.expr),
           seq("&create_expire", "=", $.expr),
           seq("&default", "=", $.expr),
+          seq("&default_insert", "=", $.expr),
           seq("&deprecated", "=", $.string),
           seq("&delete_func", "=", $.expr),
           seq("&expire_func", "=", $.expr),

but not entirely sure.