INCIDEN-839: Revert ESbuild and AWS SDK updates (#268)

## Proposed changes

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### What changed

Revert ESbuild and AWS SDK updates. This effectively reverts #259 and
#266 as the write-activity-log lambda is failing all requests after
them.


### Why did it change

The update to ESbuild isn't actually a minor update - going to 0.22.0
breaks how packages are built. See their changelog
(https://github.com/evanw/esbuild/blob/main/CHANGELOG.md) and related
issues (evanw/esbuild#3819) for more details.

We did already update to ESBuild 0.23.0 which should have solved the
problem, but we're still seeing all invocations failing. Let's revert
back to a known good config while we understand what's happened.

### Related links

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## Checklists

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### Environment variables or secrets

- [x] No environment variables or secrets were added or changed

### How to review

Please check the version numbers here against the ones in
#259