TST: fix doctests outputs

[hagenw]

Adjusts doctest output to catch object vs. str cases and the new reduced otuput for timedelta[ns] entries in pandas 3.0 (it does now only show 6 places instead of 9, e.g. 00:00:00.063022 instead of 00:00:00.063022023.

Summary by Sourcery

Documentation:

• Adjust doctest examples to explicitly use object dtype where required and match pandas 3.0 Series and timedelta[ns] display formatting.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates doctest examples to be compatible with pandas 3.0, explicitly enforcing object dtype in a Series example and adjusting documented/expected timedelta[ns] string representations to match the new 6-decimal-place display format.

File-Level Changes

Change	Details	Files
Align doctest utilities example with pandas 3.0 Series dtype behavior.	Explicitly pass dtype='object' when constructing a Series used in iter_by_file doctest. Ensure the doctest index-based iteration example remains stable across pandas versions by avoiding implicit dtype changes.	audformat/core/utils.py
Update documentation doctest outputs to match pandas 3.0 timedelta[ns] string formatting.	Adjust expected string representations of timedelta[ns] values from 9 to 6 decimal places in doctest/output snippets. Ensure combine-tables, data-example, data-misc-tables, and map-scheme docs reflect current pandas 3.0 display behavior for timedelta columns.	docs/combine-tables.rst docs/data-example.rst docs/data-misc-tables.rst docs/map-scheme.rst

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider adding a short inline comment in the doctest explaining why dtype="object" is explicitly specified (to stabilize output across pandas 3.x), so future maintainers don’t “simplify” it back and accidentally break the doctest again.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider adding a short inline comment in the doctest explaining why `dtype="object"` is explicitly specified (to stabilize output across pandas 3.x), so future maintainers don’t “simplify” it back and accidentally break the doctest again.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (3c88176) to head (c308ae7).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

Files with missing lines	Coverage Δ
audformat/core/database.py	100.0% <100.0%> (ø)
audformat/core/index.py	100.0% <100.0%> (ø)
audformat/core/testing.py	100.0% <ø> (ø)
audformat/core/utils.py	100.0% <100.0%> (ø)

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