chore(deps): update dependency com.fasterxml.jackson.core:jackson-databind to v2.12.2 (GoogleCloudPlatform#4824)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.fasterxml.jackson.core:jackson-databind](https://togithub.com/FasterXML/jackson-databind) | `2.12.1` -> `2.12.2` | [![age](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-databind/2.12.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-databind/2.12.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-databind/2.12.2/compatibility-slim/2.12.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.fasterxml.jackson.core:jackson-databind/2.12.2/confidence-slim/2.12.1)](https://docs.renovatebot.com/merge-confidence/) |

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

@@ -73,7 +73,7 @@
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
-      <version>2.12.1</version>
+      <version>2.12.2</version>
     </dependency>
 
     <!-- Test Dependencies -->