feat!: Update to CDKv2 (#23)

* feat!: Update to CDKv2

* ci: Temporarily avoid npm 8.4

Author: ohmurayu

.github/workflows/build.yml

@@ -28,7 +28,8 @@ jobs:
         with:
           node-version: ${{ matrix.node }}
           cache: npm
-      - run: npm i -g npm
+      # TODO: Temporarily avoid 8.4 due to: https://github.com/npm/cli/issues/4341
+      - run: npm i -g [email protected]
       - run: |
           echo "node: $(node --version)"
           echo "npm: $(npm --version)"