chore(deps-dev): Bump com.google.cloud:google-cloud-core (#19422)

Bumps com.google.cloud:google-cloud-core from 2.60.2 to 2.60.3.

---
updated-dependencies:
- dependency-name: com.google.cloud:google-cloud-core
  dependency-version: 2.60.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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parent/pom.xml

@@ -198,7 +198,7 @@
         <google-api-services-mail-version>v1-rev20250630-2.0.0</google-api-services-mail-version>
         <google-oauth-client-version>1.39.0</google-oauth-client-version>
         <google-cloud-bigquery-version>2.55.1</google-cloud-bigquery-version>
-        <google-cloud-core-version>2.60.2</google-cloud-core-version>
+        <google-cloud-core-version>2.60.3</google-cloud-core-version>
         <google-cloud-functions-version>2.69.0</google-cloud-functions-version>
         <google-cloud-http-client-version>2.0.1</google-cloud-http-client-version>
         <google-cloud-pubsub-version>1.141.5</google-cloud-pubsub-version>