fix: increase CNVM CI job timeout from 30 to 75 minutes (#4285)

## Summary

- The CNVM CI job `timeout-minutes` was set to 30, but the pytest
integration test polls ES with `CNVM_CONFIG_TIMEOUT=3600s` (60 min) —
**2x the entire job budget**
- After setup steps consume ~485s (disk cleanup, hermit env, `mage
build`, ES startup), the `pytest -k cnvm` step had only ~22 minutes of
budget, making completion structurally impossible when scans take longer
- Increasing to 75 minutes aligns the job lifetime with the test's
polling window and provides 15 minutes of setup headroom

Author: olegsu

.github/workflows/ci.yml

@@ -202,7 +202,7 @@ jobs:
     needs: [ init-hermit ]
     name: CNVM CI
     runs-on: ubuntu-22.04
-    timeout-minutes: 30
+    timeout-minutes: 75
     steps:
       - name: Free Disk Space (Ubuntu)
         uses: jlumbroso/free-disk-space@54081f138730dfa15788a46383842cd2f914a1be  # v1.3.1