Bump aiohttp from 3.11.18 to 3.12.15

[ezio-melotti]

This is a follow-up of:

• Bump aiohttp from 3.11.11 to 3.11.18 #291

This bumps aiohttp from 3.11.18 to 3.12.15, using the command:

docker run --rm -v $(pwd):/app -w /app python:3.12 bash -c "
  pip install --upgrade pip &&
  pip install pip-tools &&
  pip-compile --generate-hashes --output-file=requirements.txt --upgrade-package=aiohttp==3.12.15 requirements.in &&
  pip-compile --generate-hashes --output-file=dev-requirements.txt --upgrade-package=aiohttp==3.12.15 --constraint=requirements.txt dev-requirements.in
"

[sethmlarson]

LGTM, thank you!