SG-40980 Add support for VFX CY2026 - Python 3.13 - Qt 6.8

[julien-lang]

This PR adds compatibility with VFX CY2026 by updating the README badges to reflect support for:

• Python 3.9 through 3.13
• Qt 5.15 through 6.8
• PySide2 2.0 through PySide6 6.8

[Copilot]

Pull request overview

This pull request updates the codebase to support Python 3.13 and VFX Platform CY2026 by removing redundant parentheses from tuple unpacking statements, updating documentation badges, and upgrading pre-commit hook versions.

Changes:

• Removed redundant parentheses from tuple unpacking assignments throughout the codebase to align with modern Python style
• Updated README badges to reflect support for VFX Platform CY2022-CY2026 and Python 3.9-3.13
• Upgraded pre-commit hook versions and modified CI pipeline reference

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
python/task_manager/background_task.py	Added blank line for formatting consistency
python/shotgun_model/data_handler_cache.py	Removed parentheses from range() tuple unpacking
python/shotgun_model/data_handler.py	Removed parentheses from range() tuple unpacking
python/shotgun_globals/cached_schema.py	Removed parentheses from function return and split() tuple unpacking
python/external_config/scripts/external_runner.py	Removed parentheses from range() tuple unpacking and removed extra blank line
python/external_config/external_config_loader.py	Removed parentheses from result tuple unpacking
python/external_config/config/config_base.py	Consolidated multi-line tuple unpacking to single lines
azure-pipelines.yml	Changed CI tools repository branch reference
README.md	Updated VFX Platform and Python version badges with new formatting
.pre-commit-config.yaml	Upgraded pre-commit-hooks from v5.0.0 to v6.0.0 and black from 25.1.0 to 26.1.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.22%. Comparing base (d99dac9) to head (871dfbc).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #175      +/-   ##
==========================================
- Coverage   61.25%   61.22%   -0.03%     
==========================================
  Files          50       50              
  Lines        3412     3412              
==========================================
- Hits         2090     2089       -1     
- Misses       1322     1323       +1     

Flag	Coverage Δ
Linux	61.13% <ø> (ø)
Python-3.10	61.24% <ø> (ø)
Python-3.11	61.18% <ø> (-0.03%)	⬇️
Python-3.13	61.24% <ø> (-0.03%)	⬇️
Python-3.9	61.24% <ø> (ø)
Windows	61.16% <ø> (-0.03%)	⬇️
macOS	61.16% <ø> (ø)

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