Bump jackson-databind in /aws-lambda-java-events

Bumps [jackson-databind](https://github.com/FasterXML/jackson) from 2.10.5.1 to 2.12.6.1.
- [Release notes](https://github.com/FasterXML/jackson/releases)
- [Commits](https://github.com/FasterXML/jackson/commits)

---
updated-dependencies:
- dependency-name: com.fasterxml.jackson.core:jackson-databind
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

aws-lambda-java-events/pom.xml

@@ -60,7 +60,7 @@
     <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
-        <version>2.10.5.1</version>
+        <version>2.12.6.1</version>
         <scope>test</scope>
     </dependency>
     <dependency>