Requirements update

[rasapala]

🛠 Summary

Requirements update.

🧪 Checklist

• Unit tests added.
• The documentation updated.
• Change follows security best practices.
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[przepeck]

if we are dropping previous python versions we can also drop python_version >= "3.12"

[Copilot]

Pull request overview

This PR updates Python dependency pins across test and demo requirements files. The main functional impact is a shift toward newer pinned versions (pytest/requests/pillow/transformers), but it also removes TensorFlow/TensorFlow Serving dependencies for Python versions < 3.12 in several places.

Changes:

• Bumped testing dependencies (notably pytest) in test requirement sets.
• Bumped common runtime deps (requests, pillow) across tests and demos.
• Updated HuggingFace transformers pins in demos to 5.0.0rc3.
• Removed python_version < "3.12" TensorFlow/TFS/protobuf pins in multiple requirements files (breaking existing scripts/docs that still rely on Python < 3.12).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/requirements.txt	Updates pytest/requests; removes TF/TFS deps for Python < 3.12.
src/python/binding/tests/requirements.txt	Updates pytest + pluggy versions for Python binding tests.
demos/using_onnx_model/python/requirements.txt	Bumps pillow version.
demos/python_demos/requirements.txt	Bumps pillow; pins transformers to 5.0.0rc3.
demos/python_demos/clip_image_classification/download_model_requirements.txt	Pins transformers to 5.0.0rc3; bumps pillow.
demos/mediapipe/object_detection/requirements.txt	Bumps requests version.
demos/image_classification_with_string_output/requirements.txt	Removes TF for Python < 3.12 (now only TF>=3.12 marker).
demos/common/python/requirements.txt	Removes TF/TFS deps for Python < 3.12.
demos/benchmark/v3/requirements.txt	Pins transformers to 5.0.0rc3.
demos/audio/requirements.txt	Bumps requests version.
client/python/tensorflow-serving-api/samples/requirements.txt	Removes TF/TFS/protobuf pins for Python < 3.12.
client/python/kserve-api/samples/requirements.txt	Bumps requests version.