Python 3.9 drop

Author: p1c2u

.github/workflows/python-test.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
@@ -72,7 +72,7 @@ jobs:
       - name: "Setup Python"
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: "3.10"
 
       - name: Get full Python version
         id: full-python-version

.readthedocs.yaml

@@ -8,7 +8,7 @@ formats: all
 build:
   os: ubuntu-20.04
   tools:
-    python: "3.9"
+    python: "3.10"
   jobs:
     post_create_environment:
       - pip install poetry

.travis.yml

@@ -2,7 +2,6 @@ language: python
 sudo: false
 matrix:
   include:
-  - python: 3.9
   - python: 3.10
   - python: 3.11
   - python: 3.12

poetry.lock

@@ -43,7 +43,6 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -56,7 +55,7 @@ include = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.9.0"
+python = "^3.10.0"
 jsonschema = "^4.19.1"
 rfc3339-validator = "*" # requred by jsonschema for date-time checker
 jsonschema-specifications = ">=2024.10.1"