Update requirements to minimal necessary

[timothybonci]

Currently, we maintain a list (outdated) specifying dependencies of our dependencies, and there's no reason to take on that burden. (See previous MRs bumping versions of requirements that we don't directly use). If we strip this down to only what we use and allow those things to specify their own requirements, the system works great.

This also reduces the imports to minimal for keeping bundles small.

This should be entirely nonfunctional and mostly philosophical. Running this install (a couple days ago) produced the following plan:

Would install

• aiohttp-3.8.4
• aiosignal-1.3.1
• async-timeout-4.0.2
• attrs-23.1.0
• boto3-1.24.59
• botocore-1.27.96
• charset-normalizer-3.1.0
• frozenlist-1.3.3
• idna-3.4
• jmespath-1.0.1
• multidict-6.0.4
• python-dateutil-2.8.1
• s3transfer-0.6.1
• six-1.16.0
• smart-open-6.3.0
• urllib3-1.26.16
• yarl-1.9.2

I've also installed this version of the lambda into my production environment and it's working.

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[timothybonci]

CLA is under review.