chore: add generation_config.yaml to renovate bot config (googleapis#10483)

* chore: enable renovate in generation_config.yaml

* fix regex

* format json

Author: diegomarquezp

renovate.json

@@ -4,8 +4,12 @@
   ],
   "packageRules": [
     {
-      "matchUpdateTypes": ["major"],
-      "matchPackagePatterns": ["*"],
+      "matchUpdateTypes": [
+        "major"
+      ],
+      "matchPackagePatterns": [
+        "*"
+      ],
       "enabled": false
     }
   ],
@@ -19,24 +23,42 @@
     ".kokoro/nightly/graalvm-native*.cfg",
     ".kokoro/nightly/graalvm-sub-jobs/native*/common.cfg",
     ".kokoro/presubmit/graalvm-native*.cfg",
-    "owl-bot-postprocessor/synthtool/gcp/templates/java-library/.kokoro/presubmit/graalvm-native*.cfg"
+    "owl-bot-postprocessor/synthtool/gcp/templates/java-library/.kokoro/presubmit/graalvm-native*.cfg",
+    "generation_config.yaml"
   ],
   "regexManagers": [
     {
-      "fileMatch": ["^.kokoro/nightly/graalvm-native.*.cfg$",
+      "fileMatch": [
+        "^.kokoro/nightly/graalvm-native.*.cfg$",
         "^.kokoro/presubmit/graalvm-native.*.cfg$",
         "^.kokoro/nightly/graalvm-sub-jobs/native.*/common.cfg$",
         "^owl-bot-postprocessor/synthtool/gcp/templates/java-library/.kokoro/presubmit/graalvm-native.*.cfg$"
       ],
-      "matchStrings": ["value: \"gcr.io/cloud-devrel-public-resources/graalvm_sdk_platform.*:(?<currentValue>.*?)\""],
+      "matchStrings": [
+        "value: \"gcr.io/cloud-devrel-public-resources/graalvm_sdk_platform.*:(?<currentValue>.*?)\""
+      ],
       "depNameTemplate": "com.google.cloud:sdk-platform-java-config",
       "datasourceTemplate": "maven"
     },
     {
-      "fileMatch": ["README.md"],
-      "matchStrings": ["<artifactId>libraries-bom</artifactId>\\s+<version>(?<currentValue>.*?)</version>"],
+      "fileMatch": [
+        "README.md"
+      ],
+      "matchStrings": [
+        "<artifactId>libraries-bom</artifactId>\\s+<version>(?<currentValue>.*?)</version>"
+      ],
       "depNameTemplate": "com.google.cloud:libraries-bom",
       "datasourceTemplate": "maven"
+    },
+    {
+      "fileMatch": [
+        "generation_config.yaml"
+      ],
+      "matchStrings": [
+        "gapic_generator_version\\s*:\\s*(?<currentValue>.*?)\\n"
+      ],
+      "depNameTemplate": "com.google.api:gapic-generator-java",
+      "datasourceTemplate": "maven"
     }
   ]
 }