Close old db connections after getting thumbnails

[krysal]

Fixes

Related to #5334.

Description

This attempts to close the idle db connections by using the django.db.close_old_connections() function¹ after getting image thumbnails. Previously, in #5328, it was suggested that the await upstream_response.content.read() call could be the origin of the problem, so I put the db function in a finally block close to it.

Testing Instructions

N/A. CI should pass, and we will see how it behaves in production.

Checklist

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Footnotes

1. https://docs.djangoproject.com/en/5.1/ref/databases/#connection-management ↩

[obulat]

Do you think there are other places, like the dead link filtering, where we need to do the same?

[krysal]

@obulat In principle, I think it should be enough since thumbnails are constantly requested, but it will be interesting to see the graphics after deployment.