deps: update dependency com.google.cloud:google-cloud-storage to v2.15.0

Author: renovate-bot

pom.xml

@@ -154,7 +154,7 @@
  <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-storage</artifactId>
- <version>2.14.0</version>
+ <version>2.15.0</version>
  <scope>test</scope>
  </dependency>
  <dependency>