chore(deps): update dependency com.fasterxml.jackson.core:jackson-core to v2.12.5 (GoogleCloudPlatform#5885)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.fasterxml.jackson.core:jackson-core](https://togithub.com/FasterXML/jackson-core) | `2.12.4` -> `2.12.5` | [![age](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-core/2.12.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-core/2.12.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-core/2.12.5/compatibility-slim/2.12.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-core/2.12.5/confidence-slim/2.12.4)](https://docs.renovatebot.com/merge-confidence/) |

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appengine-java8/firebase-event-proxy/pom.xml

@@ -68,7 +68,7 @@
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-core</artifactId>
-      <version>2.12.4</version>
+      <version>2.12.5</version>
     </dependency>
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>

iap/pom.xml

@@ -43,7 +43,7 @@
       <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-core</artifactId>
-        <version>2.12.4</version>
+        <version>2.12.5</version>
       </dependency>
     </dependencies>
   </dependencyManagement>