deps: Update module cloud.google.com/go/alloydbconn to v1.9.0 - autoclosed

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
cloud.google.com/go/alloydbconn	v1.8.0 -> v1.9.0

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Release Notes

googlecloudplatform/alloydb-go-connector (cloud.google.com/go/alloydbconn)

### [`v1.9.0`](https://togithub.com/GoogleCloudPlatform/alloydb-go-connector/releases/tag/v1.9.0) [Compare Source](https://togithub.com/googlecloudplatform/alloydb-go-connector/compare/v1.8.0...v1.9.0) ##### Features - add support for PSC ([#​537](https://togithub.com/GoogleCloudPlatform/alloydb-go-connector/issues/537)) ([7b79b32](https://togithub.com/GoogleCloudPlatform/alloydb-go-connector/commit/7b79b32b0d0dfb3a8302155c0571a093fe3583bf)) ##### Bug Fixes - return a friendly error if the dialer is closed ([#​538](https://togithub.com/GoogleCloudPlatform/alloydb-go-connector/issues/538)) ([66d7bd0](https://togithub.com/GoogleCloudPlatform/alloydb-go-connector/commit/66d7bd0ce7f5a3a66eacacb594b9eb743fbbce86)), closes [#​522](https://togithub.com/GoogleCloudPlatform/alloydb-go-connector/issues/522)

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