chore: install protoc

Author: Noroth

.github/workflows/lint-test.yaml

@@ -26,6 +26,10 @@ jobs:
           cache-dependency-path: |
             cosmo-router/plugins/users/go.sum
           go-version: 1.24
+      - name: Install Protoc
+        uses: arduino/setup-protoc@v3
+        with:
+          version: "29.3"
       - uses: ./.github/actions/go-setup-tools
       - name: Install dependencies
         run: npm install