build(deps): bump coursier/setup-action from 1.3.8 to 1.3.9

Bumps [coursier/setup-action](https://github.com/coursier/setup-action) from 1.3.8 to 1.3.9.
- [Release notes](https://github.com/coursier/setup-action/releases)
- [Commits](coursier/setup-action@v1.3.8...v1.3.9)

---
updated-dependencies:
- dependency-name: coursier/setup-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/make-site.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: coursier/cache-action@v6
-      - uses: coursier/[email protected].8
+      - uses: coursier/[email protected].9
         with:
           apps: scala-cli