Bump toitlang/pkg-publish from 1.4.0 to 1.5.0

Bumps [toitlang/pkg-publish](https://github.com/toitlang/pkg-publish) from 1.4.0 to 1.5.0.
- [Release notes](https://github.com/toitlang/pkg-publish/releases)
- [Commits](toitlang/action-publish@v1.4.0...v1.5.0)

---
updated-dependencies:
- dependency-name: toitlang/pkg-publish
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/publish.yml

@@ -25,4 +25,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Publish
-        uses: toitlang/pkg-publish@v1.4.0
+        uses: toitlang/pkg-publish@v1.5.0