Scikit-posthocs

This release includes a number of fixes:
* Fixed critical difference diagram plotting method (thanks to Heptasphere, ederson-souza in https://github.com/maximtrp/scikit-posthocs/pull/81)
* Fixed the issue in copying within `sign_array` method (thanks to Heptasphere, https://github.com/maximtrp/scikit-posthocs/issues/77)
* Grouping with `observed=True` by default now (78)

This release fixes the return logic of [`outliers_gesd`](https://scikit-posthocs.readthedocs.io/en/latest/generated/scikit_posthocs.outliers_gesd.html) method (#83).

This release fixes a reference-related bug in `sign_plot` method (thanks to feiden, 79).

This release fixes bugs in input processing in helper methods (such as `sign_array`) in `_plotting` file (fixes 77).

This release contains potentially breaking changes and is recommended for all users:

* improved handling of block design data in all relevant posthoc and omnibus tests (thanks to mlpotter, 76).
* slightly refactored internal function for converting block design data to the required format.
* all applicable tests are now using SciPy's implementation of Studentized range distribution.
* minor fixes and improvements.

This is a big release with a number of long-awaited improvements and fixes (⚠️ potentially breaking!):
* Reimplemented some tests based on studentized range distribution (using [SciPy's implementation](https://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.studentized_range.html) now). Fixes #60, 65
* Reimplemented Nashimoto and Wright's all-pairs comparison procedure (NPM test)
* Reimplemented Tukey HSD test (using [SciPy's implementation](https://docs.scipy.org/doc/scipy/reference/generated/scipy.stats.tukey_hsd.html) as well). Fixes #61
* Linted and formatted code with [ruff](https://github.com/astral-sh/ruff). I am very excited with it. Cheers guys! 🍻
* NA values are being dropped now. Fixes 70