Remove deprecated Bound distribution

[ricardoV94]

Description

This was deprecated for a long time in favor of Truncated, which has been properly battle-tested in the meantime.

Related Issue

• Closes #
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc--7176.org.readthedocs.build/en/7176/

[twiecki]

Nice!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.24%. Comparing base (a2988c7) to head (18329b2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7176      +/-   ##
==========================================
- Coverage   92.28%   92.24%   -0.05%     
==========================================
  Files         101      100       -1     
  Lines       16923    16824      -99     
==========================================
- Hits        15618    15519      -99     
  Misses       1305     1305              

Files	Coverage Δ
pymc/distributions/__init__.py	100.00% <ø> (ø)