deps: update dependency com.google.cloud:google-cloud-datastore-bom to v2.26.4

Author: renovate-bot

google-cloud-bom/pom.xml

@@ -193,7 +193,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-datastore-bom</artifactId>
-        <version>2.26.2</version>
+        <version>2.26.4</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>