Bump viash-io/viash-actions from 5 to 6

Bumps [viash-io/viash-actions](https://github.com/viash-io/viash-actions) from 5 to 6.
- [Release notes](https://github.com/viash-io/viash-actions/releases)
- [Changelog](https://github.com/viash-io/viash-actions/blob/main/CHANGELOG.md)
- [Commits](viash-io/viash-actions@v5...v6)

---
updated-dependencies:
- dependency-name: viash-io/viash-actions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/gh-pages.yml

@@ -46,7 +46,7 @@ jobs:
 
       - uses: nf-core/setup-nextflow@v1
 
-      - uses: viash-io/viash-actions/setup@v5
+      - uses: viash-io/viash-actions/setup@v6
 
       - name: Install dependencies via renv restore
         run: |