chore: add dependencyDashboardLabels to renovate.json (#490)

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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

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-core.git",
-        "sha": "0698c6679877e0666c684ea5c5daaf8ebae7c15c"
+        "sha": "e9615ea60b30dccfae2e5c4f9247e591dbfeb52f"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "09c59c20a4bf0daed1665af59035ff240fe356df"
+        "sha": "5d3c52f5db664eee9026db76b5bcb466f3a09ca9"
       }
     }
   ],