[1335|1336] Update dependencies, docs, and CI

[cpreisinger]

Description

Update Elixir, Erlang, and Node versions and relevant CI images and documentation

Related Issues

resolves #1335 #1336

Changes Made

• Update Elixir version to 1.16.3
• Update Erlang to 26.2.5
• Update Node to 20.14.0
• Update versions in documentation
• Update CI images

Checklist

• [x] PR is assigned to a project: Challenge_gov Board
• [x] PR is assigned to a milestone: current sprint
• [x] GH issues are assigned to the PR (under Development section on the right hand side)
• [x] PR is assigned a reviewer, and requires code review and approval by a teammate
• [x] New functionality is tested and all tests are green
• [x] I have added unit tests for new functionality or updated existing tests for changes.
• [x] I have updated the documentation/README accordingly, if necessary.
• [x] If you have DB migration, it is a "safe" migration and you've confirmed it can be rolled back.
• [x] If applicable, Controllers modified contain appropriate authorization plugs
• [x] This PR has been reviewed by at least one other team member.