Bump coursier/cache-action from 7 to 8

Bumps [coursier/cache-action](https://github.com/coursier/cache-action) from 7 to 8.
- [Release notes](https://github.com/coursier/cache-action/releases)
- [Commits](coursier/cache-action@v7...v8)

---
updated-dependencies:
- dependency-name: coursier/cache-action
  dependency-version: '8'
  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

@@ -21,7 +21,7 @@ jobs:
         distribution: temurin
     - uses: actions/checkout@v6
     - uses: sbt/setup-sbt@v1
-    - uses: coursier/cache-action@v7
+    - uses: coursier/cache-action@v8
     - run: sbt -v
            "set Test / g8 / g8Properties ~= { _ + (\"scala_version\" -> \"${{ matrix.scala }}\")}"
            g8Test