Remove python 3.9 support

Author: robbinjanssen

.github/workflows/ci.yaml

@@ -52,7 +52,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.11', '3.12', '3.13']
         include:
           - poetry-version: latest
 
@@ -95,7 +95,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.11', '3.12', '3.13']
         include:
           - poetry-version: latest
 

README.md

@@ -82,7 +82,7 @@ manager.
 
 You need at least:
 
-- Python 3.9+
+- Python 3.11+
 - [Poetry][poetry-install]
 
 Install all packages, including all development requirements: