Bump actions/labeler from 5 to 6

Bumps [actions/labeler](https://github.com/actions/labeler) from 5 to 6.
- [Release notes](https://github.com/actions/labeler/releases)
- [Commits](actions/labeler@v5...v6)

---
updated-dependencies:
- dependency-name: actions/labeler
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/labeler.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v5
       with: 
         repository: "splunk/security_content"
-    - uses: actions/labeler@v5
+    - uses: actions/labeler@v6
       with:
         sync-labels: true
         configuration-path: '.github/labeler.yml'