ci: update matrix versions

Author: neersighted

.github/workflows/installer.yml

@@ -25,12 +25,12 @@ jobs:
     strategy:
       matrix:
         os: [Ubuntu, macOS, Windows]
-        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
         args:
           - ""
           - "--preview"
           - "--git https://github.com/python-poetry/poetry.git"
-          - "--version 1.1.14"
+          - "--version 1.1.15"
         include:
           - os: Ubuntu
             image: ubuntu-latest