dependency: bump mongodb driver version

[prestonvasquez]

Bump mongodb v2 version to the public release beta.

PR Checklist

• Read the Contributing documentation.
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• Name your Pull Request title clearly, concisely, and prefixed with the name of the primarily affected package you changed according to Good commit messages (such as memory: add interfaces for X, Y or util: add whizzbang helpers).
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[prestonvasquez]

Will update the docs PR #1024 once this PR is merged.