Tune FreeBSD timeouts on GitHub Actions (#10708)

Currently, our FreeBSD CI tests either complete within about 11 minutes
or timeout after 60 mins – ~50 of them spent idling erroneously.

The new values are calculated as follows:
Timeout taken of DMD's "main" workflow + 5 extra minutes

- <2036516c17/.github/workflows/main.yml (L194)>
- <2036516c17/.github/workflows/main.yml (L201)>

.github/workflows/main.yml

@@ -126,13 +126,14 @@ jobs:
             freebsd_version: '13.2'
     name: ${{ matrix.job_name }}
     runs-on: ubuntu-latest
-    timeout-minutes: 60
+    timeout-minutes: 20  # Should complete in 11 minutes
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - name: Run in VM
         uses: cross-platform-actions/action@v0.23.0
+        timeout-minutes: 19
         with:
           operating_system: freebsd
           hypervisor: qemu