FIX address deprecation warnings

[romanlutz]

• Replace HTTP_422_UNPROCESSABLE_ENTITY with HTTP_422_UNPROCESSABLE_CONTENT (starlette)
• Replace Pillow getdata() with get_flattened_data() in tests
• Fix pypdf replace_contents() deprecation using PdfWriter(clone_from=reader)
• Update is_objective=True to seed_type='objective' in doc notebooks
• Remove stale deprecation warning outputs from notebook .ipynb files

[Copilot]

Pull request overview

Addresses multiple deprecation warnings across the backend API, PDF conversion utilities, tests, and documentation artifacts to keep the codebase compatible with newer dependency versions.

Changes:

• Update FastAPI/Starlette validation error handling to use the non-deprecated 422 status constant.
• Update unit tests to avoid deprecated Pillow pixel extraction APIs.
• Update PDF modification flow to avoid deprecated pypdf page content replacement, and refresh docs/notebooks to remove deprecated is_objective usage and stale warning outputs.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/unit/converter/test_add_text_image_converter.py	Switch pixel extraction in tests to the newer Pillow API to avoid deprecation warnings.
tests/unit/converter/test_add_image_text_converter.py	Same Pillow deprecation fix for image/text converter tests.
pyrit/prompt_converter/pdf_converter.py	Use PdfWriter(clone_from=reader) and operate on attached pages to avoid pypdf deprecations.
pyrit/backend/middleware/error_handlers.py	Replace deprecated Starlette 422 constant usage in validation error responses.
doc/code/targets/2_openai_responses_target.ipynb	Remove captured stderr deprecation warning outputs from committed notebook.
doc/code/memory/8_seed_database.py	Update docs example to use seed_type="objective" instead of deprecated is_objective=True.
doc/code/memory/8_seed_database.ipynb	Same seed_type update in notebook version of the docs.
doc/code/datasets/1_loading_datasets.py	Update docs example to use seed_type="objective" instead of deprecated is_objective=True.
doc/code/datasets/1_loading_datasets.ipynb	Apply the same docs update and remove captured deprecation warning output.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 18 out of 18 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

tests/unit/converter/test_add_image_text_converter.py:79

• updated_image returned by _add_text_to_image() is a PIL Image opened from test.png, but it is never closed before os.remove("test.png"). On Windows this can intermittently fail due to the open file handle. Close updated_image (e.g., via a context manager or try/finally) before deleting the file (or ensure _add_text_to_image closes the underlying image file).

    with Image.open("test.png") as image:
        pixels_before = list(image.get_flattened_data())
    updated_image = converter._add_text_to_image("Sample Text!")
    pixels_after = list(updated_image.get_flattened_data())
    assert updated_image
    # Check if at least one pixel changed, indicating that text was added
    assert pixels_before != pixels_after
    os.remove("test.png")