Update dependency com.google.api:gax-httpjson to v2.70.3

Author: renovate-bot

pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax-httpjson</artifactId>
-      <version>2.59.1</version>
+      <version>2.70.3</version>
     </dependency>
 
     <!-- START locally built aiplatform jars using private gapic -->