build(deps): bump slack-sdk from 3.40.0 to 3.40.1 in /block-kit

Bumps [slack-sdk](https://github.com/slackapi/python-slack-sdk) from 3.40.0 to 3.40.1.
- [Release notes](https://github.com/slackapi/python-slack-sdk/releases)
- [Commits](slackapi/python-slack-sdk@v3.40.0...v3.40.1)

---
updated-dependencies:
- dependency-name: slack-sdk
  dependency-version: 3.40.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

block-kit/requirements.txt

@@ -1,4 +1,4 @@
 mypy==1.19.1
 pytest==9.0.2
 ruff==0.15.1
-slack_sdk==3.40.0
+slack_sdk==3.40.1