Bump Python language version support

* Drop support for 3.8
* Re-lock deps on Python >= 3.9
* Add testing for 3.13

Author: stefanvanburen

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/conformance.yaml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v4

.github/workflows/release.yaml

@@ -4,9 +4,6 @@ on:
   release:
     types: [published]
 
-env:
-  PYTHON_VERSION: '3.7.17'
-
 jobs:
   build:
     name: Build package
@@ -15,7 +12,7 @@ jobs:
       name: release
     strategy:
       matrix:
-        python-version: [ "3.11" ]
+        python-version: [ "3.13" ]
     steps:
       - name: Checkout source
         uses: actions/checkout@v4

Pipfile

@@ -16,4 +16,4 @@ exceptiongroup = "*"
 tomli = "*"
 
 [requires]
-python_version = "3.8"
+python_version = "3.9"