update workflow

Author: mspruc

.github/workflows/backend.yml

@@ -39,15 +39,24 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v5
       - name: Set up JDK 17
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v5
         with:
           java-version:  17
           distribution: 'temurin'
       - name: Install Protoc
         run: sudo apt install -y protobuf-compiler
-      - uses: actions/cache@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'pip'
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r python/src/pywy/requirements.txt
+      - uses: actions/cache@v5
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-maven

python/src/pywy/requirements.txt

@@ -0,0 +1,3 @@
+# we support python 3.11
+numpy==2.3.0
+cloudpickle==3.0.0