langgraph: changes for compatibility pydantic v2 / langchain-core==0.3 (#1594)

.github/workflows/_test.yml

@@ -21,7 +21,11 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
-    name: "test #${{ matrix.python-version }}"
+        core-version:
+          - ">=0.3.0.dev1,<0.4.0"
+          - "latest"
+
+    name: "test #${{ matrix.python-version }} (langchain-core: ${{ matrix.core-version }})"
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }} + Poetry ${{ env.POETRY_VERSION }}
@@ -35,7 +39,11 @@ jobs:
       - name: Install dependencies
         shell: bash
         working-directory: ${{ inputs.working-directory }}
-        run: poetry install --with dev
+        run: |
+          poetry install --with dev
+          if [ "${{ matrix.core-version }}" != "latest" ]; then
+            poetry run pip install "langchain-core${{ matrix.core-version }}"
+          fi
 
       - name: Run core tests
         shell: bash