Update CONTRIBUTING.md

[rkuo-danswer]

Description

update contributing docs.

Also a requirements upgrade to filelock ... pinning the version previously at 3.12.0 is a direct conflict with virtualenv requirements.

How Has This Been Tested?

[Describe the tests you ran to verify your changes]

Accepted Risk

[Any know risks or failure modes to point out to reviewers]

Related Issue(s)

[If applicable, link to the issue(s) this PR addresses]

Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

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