chore(deps): update dependency com.google.cloud:google-cloud-spanner to v6.2.0 (#1041)

Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -32,7 +32,7 @@
  <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-spanner</artifactId>
- <version>6.1.0</version>
+ <version>6.2.0</version>
  </dependency>
  <!-- [END spanner_install_without_bom] -->