[8.7.1] bump version to 8.7.1

[nick-funk]

What does this PR do?

Bumps the version number to v8.7.1 so we can prep a release candidate.

Note: One PR left to merge in before this can go into develop. That PR is: https://github.com/coralproject/talk/pull/4452. Thank you to @kabeaty for taking the time to fix what I believe were 4 conflicted PR's 🙌 .

These changes will impact:

• [ ] commenters
• [ ] moderators
• [ ] admins
• [X] developers

What changes to the GraphQL/Database Schema does this PR introduce?

None

Does this PR introduce any new environment variables or feature flags?

No

If any indexes were added, were they added to INDEXES.md?

None

How do I test this PR?

• let CI build
• deploy to dev1-4 and QA

Were any tests migrated to React Testing Library?

No

How do we deploy this PR?

• merge it

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