deps: update dependency io.grafeas:grafeas to v2.4.6

Author: renovate-bot

pom.xml

@@ -101,7 +101,7 @@
  <dependency>
  <groupId>io.grafeas</groupId>
  <artifactId>grafeas</artifactId>
- <version>2.4.5</version>
+ <version>2.4.6</version>
  </dependency>
  <!-- TODO: Until gax-grpc && grafeas align -->