Update nightly-test-integrations-1.20.x.yml

Author: sarahalsmiller

.github/workflows/nightly-test-integrations-1.20.x.yml

@@ -364,7 +364,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        consul-version: ["1.15", "1.17", "1.18"]
+        consul-version: ["1.15", "1.17", "1.18", "1.19"]
     env:
       CONSUL_LATEST_VERSION: ${{ matrix.consul-version }}
     steps: