Upgrade akismet-api and use new payload types for spam checks

[nick-funk]

Special thanks to @Sentynel for bringing this to our attention in their fork PR (#4123)! We used the suggestions from their PR to update our Akismet types and submission style for our spam filters!

What does this PR do?

• Updates our akismet-api dependency
• Uses new types for the payloads sent through the AkismetClient to check for spam

These changes will impact:

• commenters
• moderators
• admins
• 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?

No new indices.

How do I test this PR?

• Configure the spam tooling (Akismet) under Admin > Configure > Moderation > Spam detection filter
  • Make sure the filter is turned on (i.e. Spam detection filter option)
  • Be sure to fill out both the api key and site url
  • Try using both IP-based spam detection in both on and off modes
• Put a debug break point into: server/src/core/server/services/comments/pipeline/phases/spam.ts at Line 111
• Post comments
  • Can try using some spam comment examples from around the internet if you'd like
• See it processing the isSpam state for the comments

Where any tests migrated to React Testing Library?

No

How do we deploy this PR?

No special considerations.

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[Sentynel]

Can I ask what future work is planned for the Akismet integration?