fix: agg modifiers

[psteinroe]

fixes parsing arg lists with modifiers such as DISTINCT. before, additional args after DISTINCT were failing:

select string_agg(distinct test, ',') from x;

[netlify]

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🔨 Latest commit	5349338

[sbdchd]

I think if you upgrade cargo insta to a more recent version it stops including the snapshot_kind attr, but not 100% sure

When I run these locally it removes this attribute

[sbdchd]

Thanks!