chore: disable dependency dashboard (#56)

Source-Link: googleapis/synthtool@dfd55ad
Post-Processor: gcr.io/repo-automation-bots/owlbot-python:latest@sha256:d6761eec279244e57fe9d21f8343381a01d3632c034811a72f68b83119e58c69

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

packages/google-cloud-testutils/.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/repo-automation-bots/owlbot-python:latest
-  digest: sha256:9743664022bd63a8084be67f144898314c7ca12f0a03e422ac17c733c129d803
+  digest: sha256:d6761eec279244e57fe9d21f8343381a01d3632c034811a72f68b83119e58c69

packages/google-cloud-testutils/renovate.json

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