fix: binding error when loading aggregate

[ahey]

When upgrading our project to the latest ash package dependencies, I encountered a bug on an existing feature that was not previously present. The bug was introduced in a recent ash_sql commit.

I have used AI to create a fix for the issue, and also a test that reproduces the issue. I have verified that the test fails on ash_sql main and passes with the fix applied. I was not able to fully understand the fix – it's a small patch and i'm hoping it makes sense to someone with more experience in ash_sql than me. Otherwise, if this cannot be accepted we at least have the failing test I have created in ash_postgres that demonstrates the issue.

Contributor checklist

Leave anything that you believe does not apply unchecked.

• I accept the AI Policy, or AI was not used in the creation of this PR.
• Bug fixes include regression tests
• Chores
• Documentation changes
• Features include unit/acceptance tests
• Refactoring
• Update dependencies

[zachdaniel]

🚀 Thank you for your contribution! 🚀