chore(deps): update dependency com.google.cloud:google-cloud-spanner-jdbc to v2.12.1 (#1344)

Author: renovate-bot

samples/spring-data-jdbc/pom.xml

@@ -48,7 +48,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-jdbc</artifactId>
-      <version>2.12.0</version>
+      <version>2.12.1</version>
     </dependency>
     <dependency>
       <groupId>org.postgresql</groupId>