chore: disable dependency dashboard (googleapis#113)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/a397d906-07cc-411d-9768-30d96bd30393/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

renovate.json

@@ -1,6 +1,8 @@
 {
   "extends": [
-    "config:base",  ":preserveSemverRanges"
+    "config:base",
+    ":preserveSemverRanges",
+    ":disableDependencyDashboard"
   ],
   "ignorePaths": [".pre-commit-config.yaml"],
   "pip_requirements": {

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-compute.git",
-        "sha": "2eca2f305dea26c03703a618061bec8f2b6bf316"
+        "sha": "22a23d5fb7a5588be96a238be541817c641d068f"
       }
     },
     {