Pinned scala version to LTS

.github/workflows/ci.yml

@@ -222,6 +222,31 @@ jobs:
           modules-ignore: edomata_3 docs_3 examples_sjs1_3 edomata_3 edomata_3 examples_3 edomata-backend-tests_sjs1_3 edomata-backend-tests_3 edomata-backend-tests_native0.4_3 mdocplantuml_3
           configs-ignore: test scala-tool scala-doc-tool test-internal
 
+  validate-steward:
+    name: Validate Steward Config
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        java: [temurin@11]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout current branch (fast)
+        uses: actions/checkout@v4
+
+      - name: Setup Java (temurin@11)
+        id: setup-java-temurin-11
+        if: matrix.java == 'temurin@11'
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 11
+
+      - uses: coursier/setup-action@v1
+        with:
+          apps: scala-steward
+
+      - run: scala-steward validate-repo-config .scala-steward.conf
+
   post-build:
     name: post build
     needs: [build]

.scala-steward.conf

@@ -0,0 +1,3 @@
+updates.pin = [
+  { groupId = "org.scala-lang", artifactId = "scala3-library", version = "3.3." }
+]