update node versions

[maishathasin]

Notion ticket link

Ticket Name

Implementation description

• Updating node versions from 14.5.5 to 16.0.0

Steps to test

1. Build docker image for frontend and backend

Checklist

• My PR name is descriptive and in imperative tense
• My commit messages are descriptive and in imperative tense. My commits are atomic and trivial commits are squashed or fixup'd into non-trivial commits
• I have run the appropriate linter(s)
• I have requested a review from the PL, as well as other devs who have background knowledge on this PR or who will be building on top of this PR

[github-actions]

Visit the preview URL for this PR (updated for commit a21fb73):

https://uw-blueprint-starter-code--pr183-node-version-fpa2yx7u.web.app

_{(expires Wed, 06 Dec 2023 04:12:28 GMT)}

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[billcui57]

Looks good! Just have a question

[billcui57]

NICE