Bump asdf-vm/actions from 3 to 4

Bumps [asdf-vm/actions](https://github.com/asdf-vm/actions) from 3 to 4.
- [Release notes](https://github.com/asdf-vm/actions/releases)
- [Changelog](https://github.com/asdf-vm/actions/blob/master/CHANGELOG.md)
- [Commits](asdf-vm/actions@v3...v4)

---
updated-dependencies:
- dependency-name: asdf-vm/actions
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Test plugin
-        uses: asdf-vm/actions/plugin-test@v3
+        uses: asdf-vm/actions/plugin-test@v4
         with:
           command: ruby -v