Bump VirtusLab/scala-cli-setup from 1.5.4 to 1.6.1

Bumps [VirtusLab/scala-cli-setup](https://github.com/virtuslab/scala-cli-setup) from 1.5.4 to 1.6.1.
- [Release notes](https://github.com/virtuslab/scala-cli-setup/releases)
- [Commits](VirtusLab/scala-cli-setup@v1.5.4...v1.6.1)

---
updated-dependencies:
- dependency-name: VirtusLab/scala-cli-setup
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/lts-backport.yaml

@@ -15,7 +15,7 @@ jobs:
         with:
           fetch-depth: 0
       - uses: coursier/cache-action@v6
-      - uses: VirtusLab/scala-cli-setup@v1.5.4
+      - uses: VirtusLab/scala-cli-setup@v1.6.1
       - run: scala-cli ./project/scripts/addToBackportingProject.scala -- ${{ github.sha }}
         env:
           GRAPHQL_API_TOKEN: ${{ secrets.GRAPHQL_API_TOKEN }}