Add concurrency settings for workflow

[alrz1999]

Fixes

Related to openverse #267 by @sarayourfriend

Description

This pull request Adds concurrency settings for workflow

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.

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[sarayourfriend]

Sorry I missed this in the initial review, but the more I think about it the CI/CD workflows should only cancel in progress for pull requests. We might want to make this change to all the CI/CD workflows for the other repos as well. What do y'all think @WordPress/openverse-maintainers?

[sarayourfriend]

Makes sense to me :) Thanks again.

[stacimc]

Looks good! I think only cancelling in-progress for PRs makes a lot of sense, as well.

[krysal]

Looks good to me! Thanks, @alrz1999!