ci(release): Migrate to PyPI Trusted Publisher (#1000)

- Migrate PyPI publishing from API token to OIDC-based Trusted Publisher
- Enable package attestations for supply chain security
- Fix deprecated `skip_existing` parameter

Author: tony

.github/workflows/tests.yml

@@ -91,6 +91,9 @@ jobs:
     runs-on: ubuntu-latest
     needs: build
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+    permissions:
+      id-token: write
+      attestations: write
 
     strategy:
       matrix:
@@ -116,6 +119,5 @@ jobs:
       - name: Publish package
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          user: __token__
-          password: ${{ secrets.PYPI_API_TOKEN }}
-          skip_existing: true
+          attestations: true
+          skip-existing: true

CHANGES

@@ -31,7 +31,9 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 
 <!-- To maintainers and contributors: Please add notes for the forthcoming version below -->
 
-_Upcoming changes will be written here._
+### CI
+
+- Migrate to PyPI Trusted Publisher (#1000)
 
 ## tmuxp 1.60.0 (2025-12-06)