v3.43.0

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed

🚀 Enhancements

• feat(web): expose public ts property on ChatStream by @srtaalej in https://github.com/slackapi/python-slack-sdk/pull/1880
• feat: make thread_ts optional for assistant.threads.setSuggestedPrompts by @zimeg in https://github.com/slackapi/python-slack-sdk/pull/1901

📚 Documentation

• docs: add security policy by @WilliamBergamin in https://github.com/slackapi/python-slack-sdk/pull/1881
• docs: removing external links for unified nav by @haleychaas in https://github.com/slackapi/python-slack-sdk/pull/1895
• docs: fixing broken links to security concepts by @haleychaas in https://github.com/slackapi/python-slack-sdk/pull/1896
• docs: restore canonical security policy over bot-added SECURITY.md by @WilliamBergamin in https://github.com/slackapi/python-slack-sdk/pull/1897

🔒 Security

• fix(signature): validate signing_secret is a non-empty string by @WilliamBergamin in https://github.com/slackapi/python-slack-sdk/pull/1884

📦 Other changes

• chore(deps): update aiohttp requirement from <4,>=3.7.3 to >=3.13.5,<4 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1867
• chore(deps): update sqlalchemy requirement from <3,>=1.4 to >=2.0.49,<3 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1866
• Add missing style attribute to RichTextElementParts.Date & friends by @Lexicality in https://github.com/slackapi/python-slack-sdk/pull/1882
• chore(deps): bump codecov/codecov-action from 6.0.0 to 6.0.1 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1891
• chore(deps): bump slackapi/slack-github-action from 3.0.2 to 3.0.3 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1892
• chore(deps): bump actions/checkout from 6.0.2 to 6.0.3 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1893
• chore(deps): bump actions/stale from 10.2.0 to 10.3.0 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1890
• chore(deps): update moto requirement from <6,>=4.0.13 to >=4.2.14,<6 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1887
• chore(deps): update asyncpg requirement from <1,>=0.27 to >=0.31.0,<1 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1888
• chore(deps): bump docutils from 0.22.4 to 0.23 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1886
• chore(deps): update pytest-cov requirement from <8,>=2 to >=7.1.0,<8 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1885
• chore(deps): update flake8 requirement from <8,>=5.0.4 to >=7.3.0,<8 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1889
• docs: audit and fix docs/english markdown files by @lukegalbraithrussell in https://github.com/slackapi/python-slack-sdk/pull/1883
• chore(deps): bump codecov/codecov-action from 6.0.1 to 7.0.0 by @dependabot[bot] in https://github.com/slackapi/python-slack-sdk/pull/1894
• chore(release): version 3.43.0 by @zimeg in https://github.com/slackapi/python-slack-sdk/pull/1902

New Contributors

• @haleychaas made their first contribution in https://github.com/slackapi/python-slack-sdk/pull/1895

Full Changelog: https://github.com/slackapi/python-slack-sdk/compare/v3.42.0...v3.43.0 Milestone: https://github.com/slackapi/python-slack-sdk/milestone/119