deps: Update dependency com.google.cloud:google-cloud-shared-config to v1.5.8 (#1588)

Author: renovate-bot

pom.xml

@@ -26,7 +26,7 @@
  <parent>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-shared-config</artifactId>
- <version>1.5.7</version>
+ <version>1.5.8</version>
  </parent>
 
  <name>Cloud SQL JDBC Socket Factory</name>