Fix dependency in Cloud Run Readme

[averikitsch]

Fixes #issue

It's a good idea to open an issue first for discussion.

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• API's need to be enabled to test (tell us)
• Environment Variables need to be set (ask us to set them)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• Please merge this PR for me once it is approved.

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