Fix: releases created with GITHUB_TOKEN don't create release event

See https://docs.github.com/en/actions/security-guides/automatic-token-authentication#using-the-github_token-in-a-workflow :

> When you use the repository's GITHUB_TOKEN to perform tasks, events triggered by the GITHUB_TOKEN, with the exception of workflow_dispatch and repository_dispatch, will not create a new workflow run.

We need to trigger the release event though in order to run the cargo publish job. So this commit sets up a personal access token instead.

.github/workflows/trigger-release.yml

@@ -10,6 +10,7 @@ jobs:
     name: Trigger Release
     runs-on: ubuntu-latest
     timeout-minutes: 10
+    environment: trigger_release
 
     steps:
       - uses: actions/checkout@v3
@@ -20,4 +21,4 @@ jobs:
       - name: "Run release script"
         run: "python3 .github/workflows/trigger-release/trigger-release.py"
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.RUST_OSDEV_AUTORELEASE_TOKEN }}