fix: set minimum supported Python version to 3.9

Python 3.8 is not compatible with the codebase due to use of modern type
hint syntax (tuple[...], list[...]) which requires Python 3.9+.

Changed:
- CI workflow now tests Python 3.9, 3.10, 3.11, and 3.12
- Updated pyrightconfig.json to target Python 3.9
- Updated ruff.toml to target Python 3.9

Author: brunovcosta

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4

pyrightconfig.json

@@ -8,7 +8,7 @@
     "**/dist",
     "**/*_test.py"
   ],
-  "pythonVersion": "3.8",
+  "pythonVersion": "3.9",
   "pythonPlatform": "All",
   "typeCheckingMode": "off",
   "reportMissingImports": true,

ruff.toml

@@ -11,8 +11,8 @@ exclude = [
     "*.egg-info",
 ]
 
-# Target Python 3.8+
-target-version = "py38"
+# Target Python 3.9+
+target-version = "py39"
 
 # Line length
 line-length = 88