3714: Upgraded post service node version from 14 to 16

[AmasiaNalbandian]

Issue This PR Addresses

Fixes #3714

Type of Change

• Bugfix: Change which fixes an issue
• New Feature: Change which adds functionality
• Documentation Update: Change which improves documentation
• UI: Change which improves UI

Description

• Upgrade node from 14 to 16 in post api service.

Steps to test the PR

• Using steps in setup telescope:

1. Run pnpm i
2. Run the services using pnpm services:start. Ensure all the containers are running
3. Ensure all posts are working correctly for the post service.

Checklist

• Quality: This PR builds and passes our npm test and works locally
• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not (if applicable)
• Documentation: This PR includes updated/added documentation to user exposed functionality or configuration variables are added/changed or an explanation of why it does not(if applicable)

[gitpod-io]