Time out workflows after 45 minutes

GitHub's default timeout is 6 hours. Recently some of my GitHub Actions
jobs have started randomly stalling for that long, which is inconvenient
because it ties up a chunk of my runner quota. It apepars to be very
rare for a job to recover after stalling. It's better to time out
quicker and retry on a different runner.

Author: dtolnay

.github/workflows/ci.yml

@@ -44,6 +44,7 @@ jobs:
           - name: Windows
             os: windows
             rust: stable minus 8 releases
+    timeout-minutes: 45
     steps:
       - uses: actions/checkout@v3
       - uses: ./