Update the constraints of scikit-learn to 1.1.2.

See merge request !342

[boostrap,conda] Update conda/mamba versions

See merge request !341

Update pins of sphinx-rtd-theme to latest

See merge request !340

Updates pins to the latest versions of installable packages

See merge request !339

Check for yum presence rather than rely on CI tags

See merge request !338

From the looks of it, the CI_RUNNER_TAGS format may have changed to be
'["tag1", "tag2"]' so doing the actual check will not work.

Hence rather than relying on this environment variable content and format, check
whether yum is present on the runner and use it if so.

Remove bdt ci check from nightlies

Closes #112

See merge request !337

The nigthlies are not using anything that this check verifies.

Fix reference of tags creating nested lists

See merge request !336

Adding openpyxl/shap deps

See merge request !335

Fix changed runner tags

See merge request !334

[bootstrap,deploy] Fix bootstrap and deployment base servers for (internal) CI builds

See merge request !333

Adding xgboost library

See merge request !332

[doc] Moves CI installation information to bob/private>

See merge request !331