Fix inspect() not respecting sort=False for instance attributes

[Nabeelshar]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

AI?

• AI was used to generate this PR

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Fixed issue #3432 where inspect() was not respecting the sort=False parameter for instance attributes.

Problem

When calling rich.inspect(obj, sort=False), the attributes were still displayed in alphabetically sorted order instead of preserving their insertion order.

Root Cause

The _render() method was using dir() to get the list of attributes. Since Python's dir() always returns attributes in sorted order, even when sort=False was specified, the attributes were already sorted before the sorting logic was applied.

Solution

Modified the _render() method in rich/_inspect.py to:

1. When sort=False and the object has a __dict__, use vars(obj) to get instance attributes in their insertion order (Python 3.7+ guarantees dict insertion order)
2. Combine instance attributes (in insertion order) with class attributes from dir()
3. Only apply alphabetical sorting when sort=True is explicitly set

Changes

• Modified _render() method in rich/_inspect.py
• Added test_inspect_sort_parameter() test case
• Updated CHANGELOG.md
• Updated CONTRIBUTORS.md

Testing

• All existing tests pass (42 passed, 4 skipped)
• New test specifically validates that sort=False preserves insertion order and sort=True sorts alphabetically
• Manual testing confirms the fix works as expected

Important: Fixes #3432