chore: add regex to match unmanaged dependency check (#1941) (#1969)

Source-Link: googleapis/synthtool@ca7a716
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:cecae6152a85d55c932a64515643cf2e32a1f1b6e17503080eb07744b2177f28

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

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:084ad4c60551b075846bcb2405ec1c14b0d00ec1eb5503d4dd0d2a92cdc2d3e2
-# created: 2024-03-15T14:33:32.257974519Z
+  digest: sha256:cecae6152a85d55c932a64515643cf2e32a1f1b6e17503080eb07744b2177f28
+# created: 2024-03-25T17:31:37.187420732Z

renovate.json

@@ -23,6 +23,15 @@
       "matchStrings": ["value: \"gcr.io/cloud-devrel-public-resources/graalvm.*:(?<currentValue>.*?)\""],
       "depNameTemplate": "com.google.cloud:sdk-platform-java-config",
       "datasourceTemplate": "maven"
+    },
+    {
+      "customType": "regex",
+      "fileMatch": [
+        "^.github/workflows/unmanaged_dependency_check.yaml$"
+      ],
+      "matchStrings": ["uses: googleapis/sdk-platform-java/java-shared-dependencies/unmanaged-dependency-check@google-cloud-shared-dependencies/v(?<currentValue>.+?)\\n"],
+      "depNameTemplate": "com.google.cloud:sdk-platform-java-config",
+      "datasourceTemplate": "maven"
     }
   ],
   "packageRules": [