Fix #431: Replace deprecated dplyr/tidyselect functions

[utkarshpawade]

Fixes #431

This PR replaces deprecated functions from dplyr and tidyselect (dating back to the dplyr 1.0.0 lifecycle changes) to ensure future compatibility and suppress warnings during checks.

Changes made

• Replaced top_n() with slice_min().
• Replaced one_of() with all_of().
• Refactored group_indices() logic to use modern equivalents (group_keys() and group_split()), as group_indices() is deprecated when passed a grouped data frame.

[Copilot]

Pull request overview

This PR updates bayesplot’s MCMC interval/area data helpers to avoid deprecated dplyr/tidyselect APIs (per the dplyr 1.0.0 lifecycle changes), reducing warnings and improving forward compatibility.

Changes:

• Replaced one_of() selections with all_of().
• Replaced top_n() with slice_min() for closest-density selection.
• Refactored grouped-index splitting away from group_indices(group_df) to group_split() + group_keys(), and documented the change in NEWS.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
R/mcmc-intervals.R	Modernizes deprecated selection/ranking/grouping code paths used by mcmc_*_data() helpers.
NEWS.md	Adds a development-news bullet noting the deprecation replacements for #431.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.55%. Comparing base (c817061) to head (93afa91).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #448      +/-   ##
==========================================
- Coverage   98.63%   98.55%   -0.09%     
==========================================
  Files          35       35              
  Lines        5860     5864       +4     
==========================================
- Hits         5780     5779       -1     
- Misses         80       85       +5     

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[jgabry]

I added one more new test. I think this is now ready.