CI: Fix warnings & deprecation messages in the workflow

[ljubon]

What type of PR is this?

CI: Resolve deprecation & warning messages in workflows

What this PR does / why we need it:

Node16 has been out of support since September 2023. - more info in the post

Which issue(s) this PR fixes:

https://github.com/G-Research/gr-oss/issues/633

---

Testing results

PASSED 🟢

Test

• 🟢 https://github.com/gr-oss-devops/geras/actions/runs/8483428943/job/23244536391

CodeQL

• 🟢 https://github.com/gr-oss-devops/geras/actions/runs/9001884065

Docker*

• 🟢 https://github.com/gr-oss-devops/geras/actions/runs/9001930663/job/24729153387