CI: enable attestations, cleanup

.github/workflows/listgen.yml

@@ -15,8 +15,6 @@ jobs:
     strategy:
       matrix:
         python:
-          - "3.7"
-          - "3.8"
           - "3.9"
 
     runs-on: ubuntu-latest

.github/workflows/release.yml

@@ -26,16 +26,12 @@ jobs:
         python-version: "3.x"
 
     - name: deps
-      run: python -m pip install -U setuptools build wheel
+      run: python -m pip install -U build
 
     - name: build
       run: python -m build
 
     - name: publish
       uses: pypa/gh-action-pypi-publish@v1.10.3
-
-    - name: sign
-      uses: sigstore/gh-action-sigstore-python@v3.0.0
       with:
-        inputs: ./dist/*.tar.gz ./dist/*.whl
-        release-signing-artifacts: true
+        attestations: true

pyproject.toml

@@ -11,7 +11,7 @@ include = ["tests/"]
 [project]
 name = "stdlib-list"
 dynamic = ["version"]
-description = "A list of Python Standard Libraries (2.7 through 3.12)."
+description = "A list of Python Standard Libraries (2.7 through 3.13)."
 readme = "README.md"
 license = { file = "LICENSE" }
 authors = [{ name = "Jack Maney", email = "jackmaney@gmail.com" }]