deps: update dependency io.grafeas:grafeas to v2.4.7 (googleapis#970)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [io.grafeas:grafeas](https://togithub.com/googleapis/google-cloud-java/tree/master/google-cloud-clients/grafeas) ([source](https://togithub.com/googleapis/java-grafeas)) | `2.4.5` -> `2.4.7` | [![age](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.7/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.7/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.7/compatibility-slim/2.4.5)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/io.grafeas:grafeas/2.4.7/confidence-slim/2.4.5)](https://docs.renovatebot.com/merge-confidence/) |

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java-containeranalysis/README.md

@@ -56,13 +56,13 @@ implementation 'com.google.cloud:google-cloud-containeranalysis'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-containeranalysis:2.4.8'
+implementation 'com.google.cloud:google-cloud-containeranalysis:2.4.9'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-containeranalysis" % "2.4.8"
+libraryDependencies += "com.google.cloud" % "google-cloud-containeranalysis" % "2.4.9"
 ```
 
 ## Authentication

java-containeranalysis/pom.xml

@@ -101,7 +101,7 @@
       <dependency>
         <groupId>io.grafeas</groupId>
         <artifactId>grafeas</artifactId>
-        <version>2.4.5</version>
+        <version>2.4.7</version>
       </dependency>
       <!-- TODO: Until gax-grpc && grafeas align  -->