update GitHub Actions to Python 3.14, drop support for 3.8 and 3.9

.github/workflows/check_codestyle.yml

@@ -20,7 +20,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
+        python-version: [ "3.14" ]
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.11'
+          python-version: '3.14'
       - name: Install dependencies
         run: |
           sudo apt-get install graphviz-dev
@@ -28,7 +28,7 @@ jobs:
       - name: Generate docs
         run: pdoc spdx_tools -o docs/
       - name: Upload docs as artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
         with:
           path: docs/
 

.github/workflows/install_and_test.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, macos-latest, windows-latest ]
-        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
+        python-version: [ "3.10", "3.11", "3.12", "3.13", "3.14" ]
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/integration_test.yml

@@ -13,10 +13,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up Python 3.11
+      - name: Set up Python 3.14
         uses: actions/setup-python@v4
         with:
-          python-version: 3.11
+          python-version: 3.14
       - name: Installation
         run: |
           python -m pip install --upgrade pip

.github/workflows/prepare_release.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '3.14'
       - name: Set up dependencies
         run: |
           python -m pip install --upgrade pip

src/spdx_tools/spdx3/writer/console/relationship_writer.py

@@ -12,5 +12,5 @@ def write_relationship(relationship: Relationship, text_output: TextIO, heading:
     if heading:
         text_output.write("## Relationship\n")
     write_element_properties(relationship, text_output)
-    for property_name in relationship.__annotations__.keys():
+    for property_name in Relationship.__annotations__.keys():
         write_value(property_name, getattr(relationship, property_name), text_output)