doublezero_monitor: hardcode upstream ref (#2086)

## Summary of Changes
In #1970, we set the
upstream ref to match the pushed tag to this repo since the packaging
depended on upstream assets. This is no longer true, so this hardcodes
the upstream ref to v0.1.0 for the time being.

## Testing Verification
N/A

Author: packethog

.github/workflows/release.doublezero.monitor.tool.yml

@@ -16,15 +16,12 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - name: Extract version from tag
-        id: get_version
-        run: echo "VERSION=${GITHUB_REF_NAME#doublezero-monitor-tool/}" >> $GITHUB_OUTPUT
       - name: Checkout doublezero_monitor repo
         uses: actions/checkout@v4
         with:
           repository: alexpyattaev/doublezero_monitor
           path: doublezero_monitor
-          ref: ${{ steps.get_version.outputs.VERSION }}
+          ref: v0.1.0
       - name: install dependencies for rpm packaging
         run: |
           sudo apt update