FIPS compatibility

[opopops]

Using FIPS-enabled libraries I get the following error trying to generate a PDF:

Traceback (most recent call last):
  File "/workspace/test.py", line 2, in <module>
    HTML('https://weasyprint.org/').write_pdf('/workspace/weasyprint-website.pdf')
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/__init__.py", line 259, in write_pdf
    self.render(font_config, counter_style, **options)
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/__init__.py", line 216, in render
    return Document._render(self, font_config, counter_style, options)
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/document.py", line 254, in _render
    root_box = build_formatting_structure(
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/formatting_structure/build.py", line 62, in build_formatting_structure
    box_list = element_to_box(
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/formatting_structure/build.py", line 185, in element_to_box
    child_boxes = element_to_box(
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/formatting_structure/build.py", line 185, in element_to_box
    child_boxes = element_to_box(
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/formatting_structure/build.py", line 185, in element_to_box
    child_boxes = element_to_box(
  [Previous line repeated 2 more times]
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/formatting_structure/build.py", line 253, in element_to_box
    return html.handle_element(element, box, get_image_from_uri, base_url)
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/html.py", line 81, in handle_element
    return HTML_HANDLERS[element.tag](
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/html.py", line 126, in handle_img
    image = get_image_from_uri(
  File "/workspace/.venv/lib/python3.10/site-packages/weasyprint/images.py", line 329, in get_image_from_uri
    image_id = md5(url.encode()).hexdigest()
ValueError: [digital envelope routines] unsupported

As md5 function here is not used in a security context, we should set usedforsecurity=False argument to be able to generate pdf in a FIPS-enabled environment (See https://docs.python.org/3/library/hashlib.html non-cryptographic hash functions must use usedforsecurity=False).