Update nokogiri version for security vulnerability

[lukoktonos]

Update nokogiri due to security vulnerability Lock down mongo so it doesn't update too much

Pull requests into Health Data Standards require the following. Submitter and reviewer should :white_check_mark: when done. For items that are not-applicable, note it's not-applicable ("N/A") and :white_check_mark:.

Submitter:

• [x] This pull request describes why these changes were made.
• [x] This PR is into the correct branch.
• [x] Internal ticket for this PR: https://jira.mitre.org/browse/BONNIE-1615
• [x] Internal ticket links back to this PR
• [x] Code diff has been done and been reviewed (it does not contain: additional white space, not applicable code changes, debug statements, etc.)
• [x] Tests are included and test edge cases
• [x] Tests have been run locally and pass
• [x] Code coverage has not gone down and all code touched or added is covered.

Bonnie Reviewer:

Name: @hossenlopp

• [x] Gemfile update sanity check