ci: run tests on Node.js v20

Author: merceyz

.github/workflows/integration-workflow.yml

@@ -200,7 +200,7 @@ jobs:
       fail-fast: false
       matrix:
         # We run the ubuntu tests on multiple Node versions with 2 shards since they're the fastest.
-        node: [14, 16, 18, 19]
+        node: [14, 16, 18, 20]
         platform: [ubuntu-latest]
         shard: ['1/2', '2/2']
         # We run the rest of the tests on the minimum Node version we support with 3 shards.