Fix running tests on Node 18.8

[henrymercer]

This PR fixes errors like this:

  TypeError: Cannot destructure property 'payload' of 'sourceMap' as it is null.

  › file://node_modules/mem/dist/index.js:42:27
  › file://node_modules/mem/dist/index.js:42:27
  › Object.<anonymous> (src/analyze-action-post-helper.test.ts:12:5)

  ✖ src/analyze-action-post-helper.test.ts exited with a non-zero exit code: 1

when running tests on Node 18.8. The fix is simple: update ava to v4.3.3. This version of ava adds compatibility with Node 18.8.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

[adityasharad]

Sounds reasonable. I had hoped Dependency Review would show me the other dependencies that were updated in the lockfile as a result, but it's clear what you're primarily changing here.