CI: Fix warnings & deprecation messages in the workflows

[ljubon]

What type of PR is this?

CI: Resolve deprecation & warning messages in workflows
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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:

Resolves: https://github.com/G-Research/gr-oss/issues/640

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Test results - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197206

It uses external actions dawidd6/action-download-artifact@246dbf436b23d7c49e21a7ab8204ca9ecd1fe615 which needs tobe

Testing results

🟢 Build JVM - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197205

🟠 Build Python - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197209
NOTE on upstream, this workflow is not run at all

🟢 Build Snapshot - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197204
NOTE on upstream, this workflow is not run at all

🟢 Check - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197212
NOTE this workflow is called from CI workflow, it can be verified it's green here

🟢 CI - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197234

🟢 Test JVM - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197234
NOTE this workflow is called from CI workflow, it can be verified it's green here

🟢 Test Python - https://github.com/gr-oss-devops/spark-extension/actions/runs/8537197234
NOTE this workflow is called from CI workflow, it can be verified it's green here

🟢 Test results - https://github.com/gr-oss-devops/spark-extension/actions/runs/8878086091

[github-actions]

Test Results

   631 files  ±0     631 suites  ±0   1h 45m 4s ⏱️ + 1m 56s
   499 tests ±0     499 ✅ ±0   0 💤 ±0  0 ❌ ±0 
19 419 runs  ±0  19 355 ✅ ±0  64 💤 ±0  0 ❌ ±0 

Results for commit 6aeffe1. ± Comparison against base commit ce8737b.

[EnricoMi]

LGTM!