Bump DynamoDB SDK to version 2.13.18

Author: carlzogh

aws-lambda-java-events-sdk-transformer/README.md

@@ -33,7 +33,7 @@ To use this library as a transformer to the AWS DynamoDB Java SDK v2, also add t
     <dependency>
         <groupId>software.amazon.awssdk</groupId>
         <artifactId>dynamodb</artifactId>
-        <version>2.11.12</version>
+        <version>2.13.18</version>
     </dependency>
 </dependencies>
 ```

aws-lambda-java-events-sdk-transformer/RELEASE.CHANGELOG.md

@@ -1,6 +1,7 @@
 ### May 20, 2020
 `2.0.0`:
 - Updated AWS SDK V2 transformers for `DynamodbEvent` to work with `aws-lambda-java-events` versions `3.0.0` and up
+- Bump `software.amazon.awssdk:dynamodb` to version `2.13.18`
 
 ### Apr 29, 2020
 `1.0.0`:

aws-lambda-java-events-sdk-transformer/pom.xml

@@ -49,7 +49,7 @@
     <dependency>
       <groupId>software.amazon.awssdk</groupId>
       <artifactId>dynamodb</artifactId>
-      <version>2.11.12</version>
+      <version>2.13.18</version>
       <scope>provided</scope>
     </dependency>
     <dependency>