chore: add dependencyDashboardLabels to renovate.json (googleapis#475)

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Source-Link: googleapis/synthtool@5d3c52f

renovate.json

@@ -69,5 +69,8 @@
     }
   ],
   "semanticCommits": true,
-  "masterIssue": true
+  "dependencyDashboard": true,
+  "dependencyDashboardLabels": [
+    "type: process"
+  ]
 }

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-datastore.git",
-        "sha": "9ce8e9d6cbd2692e146e1c5d5103ec5e1b59e313"
+        "sha": "3aa2cf118342419a317a68f3ec1a61917bcbb511"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "09c59c20a4bf0daed1665af59035ff240fe356df"
+        "sha": "5d3c52f5db664eee9026db76b5bcb466f3a09ca9"
       }
     }
   ],