Uses Swift version 6 in the generate-and-publish-docs job.

Author: wei18

.github/workflows/Doc.yml

@@ -25,7 +25,7 @@ jobs:
     uses: sersoft-gmbh/oss-common-actions/.github/workflows/swift-generate-and-publish-docs.yml@main
     with:
       os: ubuntu
-      swift-version: '5.9'
+      swift-version: '6'
       organisation: ${{ github.repository_owner }}
       repository: ${{ github.event.repository.name }}
       pages-branch: gh-pages