chore(deps): Bump the minor-and-patch group across 1 directory with 3 updates

Bumps the minor-and-patch group with 3 updates in the /mcp/slack_tool directory: [slack-sdk](https://github.com/slackapi/python-slack-sdk), [fastmcp](https://github.com/PrefectHQ/fastmcp) and [starlette](https://github.com/Kludex/starlette).


Updates `slack-sdk` from 3.42.0 to 3.43.0
- [Release notes](https://github.com/slackapi/python-slack-sdk/releases)
- [Commits](slackapi/python-slack-sdk@v3.42.0...v3.43.0)

Updates `fastmcp` from 3.4.0 to 3.4.2
- [Release notes](https://github.com/PrefectHQ/fastmcp/releases)
- [Changelog](https://github.com/PrefectHQ/fastmcp/blob/main/docs/changelog.mdx)
- [Commits](PrefectHQ/fastmcp@v3.4.0...v3.4.2)

Updates `starlette` from 1.2.1 to 1.3.1
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@1.2.1...1.3.1)

---
updated-dependencies:
- dependency-name: slack-sdk
  dependency-version: 3.43.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor-and-patch
- dependency-name: fastmcp
  dependency-version: 3.4.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: minor-and-patch
- dependency-name: starlette
  dependency-version: 1.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor-and-patch
...

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

Author: dependabot[bot]

mcp/slack_tool/pyproject.toml

@@ -6,11 +6,11 @@ readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
     "requests>=2.34.2",
-    "slack_sdk>=3.42.0",
+    "slack_sdk>=3.43.0",
     "authlib>=1.7.2",   # Indirect; prevents CVE-2026-27962
     "urllib3>=2.7.0",   # Indirect; prevents CVE-2025-66418
     "python-multipart>=0.0.32", # Indirect; prevents CVE-2026-24486
-    "fastmcp>=3.4.0",           # Indirect; prevents CVE-2026-32871
-    "starlette>=1.2.1",        # Indirect; prevents CVE-2025-62727
+    "fastmcp>=3.4.2",           # Indirect; prevents CVE-2026-32871
+    "starlette>=1.3.1",        # Indirect; prevents CVE-2025-62727
     "cryptography>=48.0.0,<49", # Indirect; prevents CVE-2026-26007
 ]