Fix pytest ini_options schema annotations

[snoopuppy582]

Summary

• remove the deprecated annotation from the [tool.pytest.ini_options] schema path
• keep the table description aligned with pytest's supported INI-style pyproject configuration
• add a pyproject positive fixture covering [tool.pytest.ini_options]

Tests

• node ./cli.js check --schema-name=partial-pytest.json
• node ./cli.js check --schema-name=pyproject.json
• npx prettier --config .prettierrc.cjs --ignore-path .gitignore --check src/schemas/json/partial-pytest.json src/test/pyproject/pytest-ini-options.toml
• npm run typecheck

Fixes #5278

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @madskristensen and @hyperupcall - if they write a comment saying "LGTM" then it will be merged.

[hyperupcall]

Thanks