fix: replace deprecated workflow runtimes

Author: t-col

.github/workflows/ci.yml

@@ -14,12 +14,14 @@ jobs:
     name: Test (Java 8)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
+
+      - name: Install devcontainer CLI
+        run: npm install -g @devcontainers/cli@0
 
       - name: Run tests in dev container
-        uses: devcontainers/ci@v0.3
         env:
           JAVA_VERSION: "8"
-        with:
-          push: never
-          runCmd: ./mvnw -B test
+        run: |
+          devcontainer up --workspace-folder .
+          devcontainer exec --workspace-folder . bash -lc "./mvnw -B test"