chore: Upgrade Poetry to `1.6.1`

Poetry dropped this support in version 1.6.0 since 3.7 has reached end of life.

.github/workflows/docker-image.yml

@@ -38,8 +38,8 @@ jobs:
 
     strategy:
       matrix:
-        python_image_tag: ["3.7-slim", "3.8-slim", "3.9-slim", "3.10-slim", "3.11-slim"]
-        poetry_version: ["1.4.2", "1.5.1"]
+        python_image_tag: ["3.8-slim", "3.9-slim", "3.10-slim", "3.11-slim"]
+        poetry_version: ["1.5.1", "1.6.1"]
 
     steps:
     - uses: actions/checkout@v3