Use the docker image for the label check action to improve speed

[AetherUnbound]

Description

Another follow up to #350 (testing GitHub Actions is always fun 😅), this brings our workflow into parity with the documentation as described for the action, which uses a docker:// protocol with the uses keyword to run a published docker image.

If this is left out, the image is built and then run for every action, which is quite time consuming (example: https://github.com/WordPress/openverse-infrastructure/actions/runs/3690796494/jobs/6248175116)

Testing Instructions

Check this against the documentation linked above to make sure there are no other differences.

Checklist

• My pull request has a descriptive title (not a vague title like
  Update index.md).
• My pull request targets the default branch of the repository (main) or
  a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible
  errors.

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

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Everyone is permitted to copy and distribute verbatim copies of this
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Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[zackkrida]

🤦 Having now read the documentation fully, this looks right. Thanks again!

[stacimc]

LGTM!