Add Michael as codeowner for store crate

[michaelsproul]

Proposed Changes

I'm adding myself as a codeowner for the store crate so that I can more easily keep track of database-related PRs.

[mergify]

Some required checks have failed. Could you please take a look @michaelsproul? 🙏

[mergify]

This pull request has been removed from the queue for the following reason: pull request dequeued.

Pull request #7667 has been dequeued. The pull request rule doesn't match anymore. The following conditions don't match anymore:

• label=ready-for-merge.

You should look at the reason for the failure and decide if the pull request needs to be fixed or if you want to requeue it.
If you do update this pull request, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.

[mergify]

This pull request has been removed from the queue for the following reason: checks failed.

The merge conditions cannot be satisfied due to failing checks:

• ☑️ test-suite-success

You can check the last failing draft PR here: #7668.

You may have to fix your CI before adding the pull request to the queue again.
If you update this pull request, to fix the CI, it will automatically be requeued once the queue conditions match again.
If you think this was a flaky issue instead, you can requeue the pull request, without updating it, by posting a @mergifyio requeue comment.