set 3.9 lowest supported python version

Signed-off-by: Simoh23999 <simocasmina@gmail.com>

Author: Simoh23999

.github/workflows/python.yml

@@ -86,7 +86,7 @@ jobs:
             toxenv-factors: '-current'
           - # test with the lowest dependencies
             os: ubuntu-latest
-            python-version: '3.8'
+            python-version: '3.9'
             toxenv-factors: '-lowest'
     steps:
       - name: Checkout
@@ -117,15 +117,14 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-          - macos-13  # macos-latest might be incompatible to py38 - see https://github.com/CycloneDX/cyclonedx-python-lib/pull/599#issuecomment-2077462142
+          - macos-13  
           - windows-latest
         python-version:
           - "3.13" # highest supported
           - "3.12"
           - "3.11"
           - "3.10"
-          - "3.9"
-          - "3.8"  # lowest supported
+          - "3.9" # lowest supported          
         toxenv-factors:
           - '-allExtras'
           - '-noExtras'
@@ -219,7 +218,7 @@ jobs:
         # see https://github.com/actions/setup-python
         uses: actions/setup-python@v5
         with:
-          python-version: '>=3.8 <=3.13'  # supported version range
+          python-version: '>=3.9 <=3.13'  # supported version range
       - name: Validate Python Environment
         shell: python
         run: |

pyproject.toml

@@ -47,7 +47,6 @@ classifiers = [
   'Topic :: Software Development',
   'Topic :: System :: Software Distribution',
   'License :: OSI Approved :: Apache Software License',
-  'Programming Language :: Python :: 3.8',
   'Programming Language :: Python :: 3.9',
   'Programming Language :: Python :: 3.10',
   'Programming Language :: Python :: 3.11',
@@ -68,7 +67,7 @@ keywords = [
 "Funding" = "https://owasp.org/donate/?reponame=www-project-cyclonedx&title=OWASP+CycloneDX"
 
 [tool.poetry.dependencies]
-python = "^3.8"
+python = "^3.9"
 packageurl-python = ">=0.11, <2"
 py-serializable =  "^2.0.0"
 sortedcontainers = "^2.4.0"
@@ -84,9 +83,9 @@ xml-validation = ["lxml"]
 [tool.poetry.group.dev.dependencies]
 ddt = "1.7.2"
 coverage = "7.6.1"
-flake8 = { version="7.1.2", python=">=3.8.1" }
-flake8-annotations = { version="3.1.1", python=">=3.8.1" }
-flake8-bugbear = { version="24.12.12", python=">=3.8.1" }
+flake8 = { version="7.1.2", python=">=3.9.1" }
+flake8-annotations = { version="3.1.1", python=">=3.9.1" }
+flake8-bugbear = { version="24.12.12", python=">=3.9.1" }
 flake8-copyright-validator = "0.0.1"
 flake8-isort = "6.1.1"
 flake8-quotes = "3.4.0"

tox.ini

@@ -8,7 +8,7 @@ minversion = 4.0
 envlist =
     flake8
     mypy-{current,lowest}
-    py{313,312,311,310,39,38}-{allExtras,noExtras}
+    py{313,312,311,310,39}-{allExtras,noExtras}
     bandit
 skip_missing_interpreters = True
 usedevelop = False
@@ -33,7 +33,7 @@ setenv =
 commands =
     # mypy config is in own file: `.mypy.ini`
     !lowest: poetry run mypy
-     lowest: poetry run mypy --python-version=3.8
+     lowest: poetry run mypy --python-version=3.9
 
 [testenv:flake8]
 commands =