Update Poetry to `1.1.14`

Poetry released version `1.1.14` today, so we want to make that available as part of this Docker build.

.github/workflows/docker-image.yml

@@ -32,7 +32,7 @@ jobs:
     strategy:
       matrix:
         python_image_tag: ["3.7-slim", "3.8-slim", "3.9-slim", "3.10-slim"]
-        poetry_version: ["1.0.10", "1.1.13"]
+        poetry_version: ["1.0.10", "1.1.14"]
 
     steps:
     - uses: actions/checkout@v3