Dependency updates and Node.js LTS update

[mgwalker]

Just what it says.

• The Bolt API made one breaking change for us: the directMention middleware was changed that instead of needing to call a function to obtain it, the middleware is returned directly. So directMention() was changed to directMention in our code.
• The updated Prettier wanted parentheses around the return value of a ternary (q-expand.js).
• Updating to eslint@^9 is a whole thing. The config file format changed. It should be done, but there's no particular rush. The new config format looks a lot cleaner so that's great, though.
• Updating to the AWS JS SDK version 3 is a priority because version 2 hits EOL in March or so. It's not much of a lift, but does require a bit of rework of the hugme bot, which possibly ought to be deprecated anyway.

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Checklist:

• Code has been formatted with prettier
• All the rest are N/A