chore: drop Python 3.9 support for running aws-lambda-builders

- Update python_requires to >=3.10
- Remove Python 3.8 and 3.9 classifiers from setup.py
- Remove 3.9 from CI test matrices (unit-functional, python-pip, python-uv)
- Update black target_version to py310-py314
- Simplify requirements/dev.txt version conditionals

Note: Building Lambda functions targeting the python3.9 runtime is still
fully supported. This change only affects the minimum Python version
required to run aws-lambda-builders itself.

Author: roger-zhangg

.github/workflows/build.yml

@@ -65,7 +65,6 @@ jobs:
           - ubuntu-latest
           - windows-latest
         python:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
@@ -262,7 +261,6 @@ jobs:
           - ubuntu-latest
           - windows-latest
         python:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
@@ -291,7 +289,6 @@ jobs:
           - ubuntu-latest
           - windows-latest
         python:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"

pyproject.toml

@@ -20,7 +20,7 @@ max-branches = 13
 
 [tool.black]
 line-length = 120
-target_version = ['py37', 'py38', 'py39']
+target_version = ['py310', 'py311', 'py312', 'py313', 'py314']
 exclude = '''
 
 (

requirements/dev.txt

@@ -1,15 +1,12 @@
-coverage==7.13.5; python_version>="3.10"
-coverage==7.10.7; python_version<"3.10"
+coverage==7.13.5
 flake8==3.8.4
-pytest-cov==6.3.0; python_version>="3.9"
-pytest-cov==5.0.0; python_version<"3.9"
+pytest-cov==6.3.0
 
 # Test requirements
 pytest>=6.1.1
 parameterized==0.9.0
 pyelftools~=0.32 # Used to verify the generated Go binary architecture in integration tests (utils.py)
 
 # formatter
-black==26.3.1; python_version>="3.10"
-black==25.11.0; python_version<"3.10"
+black==26.3.1
 ruff==0.15.5

setup.py

@@ -43,8 +43,8 @@ def read_version():
     license="Apache License 2.0",
     packages=find_packages(exclude=["tests.*", "tests"]),
     keywords="AWS Lambda Functions Building",
-    # Support 3.8 or greater
-    python_requires=(">=3.8"),
+    # Support 3.10 or greater
+    python_requires=(">=3.10"),
     entry_points={"console_scripts": ["{}=aws_lambda_builders.__main__:main".format(cmd_name)]},
     install_requires=read_requirements("base.txt") + read_requirements("python_pip.txt"),
     extras_require={"dev": read_requirements("dev.txt")},
@@ -58,8 +58,6 @@ def read_version():
         "License :: OSI Approved :: Apache Software License",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",