Update ContentSource to match MediaMixin

[obulat]

Fixes

Fixes #2488 by @sarayourfriend

Description

This PR updates the ContentProvider.provider_identifier field length to match AbstractMedia.provider (80 characters).

Testing Instructions

The CI should pass.

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[stacimc]

Setting the max_length to 80 to match the higher of the two constraints seems reasonable to me 👍 But don't we need to run makemigrations here?

[sarayourfriend]

Definitely need makemigrations, luckily the CI caught that 🙂 https://github.com/WordPress/openverse/actions/runs/10684310921/job/29614652675?pr=4854

[sarayourfriend]

LGTM! I updated the PR title to correct the model name @obulat, just a heads-up in case you are surprised by it 🙂

I'm pretty confident that this will be a non-problem to apply in production. The table is very small, anyway. Based on the Postgres documentation for varchar, the database will need to adjust the padding on each row for the column, but I'd expect that to be fast. varchar is TOAST, so it doesn't need to change the width of the column within the table anyway.

[github-actions]

This PR has migrations. Please rebase it before merging to ensure that conflicting migrations are not introduced.