build(deps): package updates (#403)

I ran `npm list` and, one at a time, installed the latest minor version
of each package given. After installing, I ran `npm run
start-fixtures-server` and `npm run test --ignore-scripts` to attempt to
reproduce the test failures we're seeing in #394. Each time, the tests
succeeded.

I'm going to merge this PR and close #394 for now, and then we'll see if
additional test failures occur when a new lockfile maintenance PR is
proposed.