Bump com.google.cloud:google-cloud-spanner-jdbc from 2.19.3 to 2.19.4 (#541)

Bumps
[com.google.cloud:google-cloud-spanner-jdbc](https://github.com/googleapis/java-spanner-jdbc)
from 2.19.3 to 2.19.4.
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pom.xml

@@ -165,7 +165,7 @@
                 <dependency>
                     <groupId>com.google.cloud</groupId>
                     <artifactId>google-cloud-spanner-jdbc</artifactId>
-                    <version>2.19.3</version>
+                    <version>2.19.4</version>
                     <scope>runtime</scope>
                 </dependency>
             </dependencies>