Switch to Trusted Publishing and add Dependabot

Replaces PYPI_API_TOKEN secret with OIDC-based trusted publishing via
PyPI's trusted publisher configuration. Also updates action versions
(checkout v4, setup-python v5) and adds Dependabot for monthly
GitHub Actions version updates.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: derek73

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/python-publish.yml

@@ -1,11 +1,3 @@
-# This workflow will upload a Python Package using Twine when a release is created
-# For more information see: https://help.github.com/en/actions/language-and-framework-guides/using-python-with-github-actions#publishing-to-package-registries
-
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
-
 name: Upload Published Python Package
 
 on:
@@ -14,13 +6,15 @@ on:
 
 jobs:
   deploy:
-
     runs-on: ubuntu-latest
+    environment: pypi
+    permissions:
+      id-token: write
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: '3.x'
     - name: Install dependencies
@@ -30,7 +24,4 @@ jobs:
     - name: Build package
       run: python -m build
     - name: Publish package
-      uses: pypa/gh-action-pypi-publish@27b31702a0e7fc50959f5ad993c78deac1bdfc29
-      with:
-        user: __token__
-        password: ${{ secrets.PYPI_API_TOKEN }}
+      uses: pypa/gh-action-pypi-publish@release/v1