Updated offsetbox.py

[Anjini2004]

PR summary

PR checklist

• "closes #0000" is in the body of the PR description to link the related issue
• new and changed code is tested
• Plotting related features are demonstrated in an example
• New Features and API Changes are noted with a directive and release note
• Documentation complies with general and docstring guidelines

[ksunden]

Thank you for your pull request!

Since these methods are fully deprecated, their implementation should also be removed.

Here are the deprecation notes that you can slightly reword to reflect removal rather than deprecation (they can both appear in the same file):

matplotlib/doc/api/prev_api_changes/api_changes_3.7.0/deprecations.rst

Line 191 in 04e1332

``OffsetBox.get_extent_offsets`` and ``OffsetBox.get_extent``

matplotlib/doc/api/prev_api_changes/api_changes_3.7.0/deprecations.rst

Line 211 in 04e1332

``offsetbox.bbox_artist``

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[QuLogic]

The entirety of the functions marked with _api.deprecated should be removed.

[tacaswell]

xref #26865

[tacaswell]

Need to remove the deprecated method and add a API change note.

[ksunden]

Thanks again for the pull request, however, looks like the required changes for this deprecation got merged in #26910, so unfortunately I am going to close this version. Thank you for your interest and we hope to hear from you again!