Update common Prometheus files (#923)

Signed-off-by: prombot <prometheus-team@googlegroups.com>

Author: prombot

.github/workflows/govulncheck.yml

@@ -20,6 +20,10 @@ jobs:
     runs-on: ubuntu-latest
     name: Run govulncheck
     steps:
+      - name: Install snmp_exporter/generator dependencies
+        id: snmp-deps
+        run: sudo apt-get update && sudo apt-get -y install libsnmp-dev
+        if: github.repository == 'prometheus/snmp_exporter'
       - id: govulncheck
         uses: golang/govulncheck-action@b625fbe08f3bccbe446d94fbf87fcc875a4f50ee # v1.0.4
         env: