build: upgrade FOCA & fix ReadTheDocs

[alohamora]

Description

1. Upgrade foca to the latest version (0.12.1). This change introduces no updates in config/functionality as the foca upgrade doesn't introduce any breaking changes.
2. fix readthedocs build failure by adding documentation build config and requirements

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] I have not reduced the existing code coverage
• [ ] I have added docstrings following the Python style guidelines of this project to all new modules, classes, methods and functions are documented with docstrings following; I have updated any previously existing docstrings, if applicable
• [ ] I have updated any sections of the app's documentation that are affected by the proposed changes, if applicable

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (8ac2118) 100.00% compared to head (2817aa9) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #38 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 6 6 Lines 190 190 ========================================= Hits 190 190 ```

:umbrella: View full report in Codecov by Sentry.
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[alohamora]

@uniqueg the RtD ci step still failed, as per the error, it is trying to find a file named .readthedocs.yaml for it's configuration which does not exist in our repo

[alohamora]

finally, all test passed 😛 had to add additional requirements for building documentation with the sphinx_rtd_theme as now readthedocs does not download this theme package by default.

[alohamora]

@uniqueg can you please review this PR