use node 20 in github ca

Author: johanneswilm

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
                 os:
                     - ubuntu-22.04
                 node-version:
-                    - 18.x
+                    - 20.x
         steps:
             - name: "Set up Node.js ${{ matrix.node-version }}"
               uses: actions/setup-node@v1