chore: migrate formatting to ruff, update CI/CD and bump to v0.20.3

[frack113]

This PR covers the changes between v0.20.2 and v0.20.3.

Dependencies & Tooling

• Replace Black with Ruff for formatting and linting in pre-commit hooks, CI workflows, and pyproject.toml
• Add check-jsonschema as a dev dependency for JSON schema validation
• Update pre-commit Black hook version references before removal

CI/CD & GitHub Actions

• Bump GitHub Actions to checkout@v5, setup-python@v6, and gh-action-pypi-publish@release/v1
• Add Poetry cache in CI workflows
• Install ruff via pip in CI test workflow for linting
• Remove update_data.yml workflow (replaced by manual/data sync process)
• Add Poetry setup + poetry install in schema validation workflow

Configuration

• Ruff configuration added to pyproject.toml (line length 100, target py310, project-specific ignores for tests/tools)
• Mypy configuration added with relaxed permissive settings and pytest ignore
• Version bump to 0.20.3

Code style fixes

• Reorder imports across all SigmaHQ validator modules to follow consistent ordering (standard library → third-party → local)
• Format long lines in sigmahq_data.py (logsource field lists split across multiple lines)
• Add type ignore comment in correlation.py for rule.rules length check
• Format pformat() calls in tools/update_ref.py

Test updates

Fix validation checks across all test files to match updated validator logic:

• condition validators (missing_asterisk, ofselection, ofthem)
• correlation validators (groupby_existence, rules_minimum)
• date validators (modified_date_order, modified_without_date, redundant_modified)
• description validators (existence, length, link_in_description)
• field validators (user, fieldname_cast, invalid_all_modifier, invalid_fieldname, invalid_hash_kv, redundant_field, space_fieldname, fields_existence)
• fields validators (unknown_field)
• filename validators (correlation_prefix, convention, prefix)
• other validators (logsource_unknown, sysmon_missing_eventid, github_link, mitre_link, status_to_high, status)
• tag validators (detection, techniques_without_tactics, tlp, unique_detection, unique_tlp)
• title validators (title_case, title_end, title_length, title_start)
• Update test_config.py to match new config structure
• Add missing test assertions for author_existence and category_eventid / category_windows_provider_name validators

[frack113]

$  pip list | grep -i sigma
pySigma                                1.4.0
pySigma-validators-sigmahq             0.20.3
sigma-cli                              3.0.2
$
$ sigma check rules* -c tests/sigma_cli_conf.yml 
Parsing Sigma rules  [####################################]  100%          
Parsing Sigma rules  [####################################]  100%
Parsing Sigma rules  [####################################]  100%
Parsing Sigma rules  [####################################]  100%
Parsing Sigma rules  [####################################]  100%
Parsing Sigma rules  [####################################]  100%
Checking Sigma rules  [####################################]  100%          

=== Summary ===
Found 0 errors, 0 condition errors and 0 issues.
No rule errors found.
No condition errors found.
No validation issues found.

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