Bump org.openapitools:jackson-databind-nullable from 0.2.4 to 0.2.6 (#164)

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Author: dependabot[bot]

contract/pom.xml

@@ -34,7 +34,7 @@
                 <dependency>
                     <groupId>org.openapitools</groupId>
                     <artifactId>jackson-databind-nullable</artifactId>
-                    <version>0.2.4</version>
+                    <version>0.2.6</version>
                 </dependency>
                 <dependency>
                     <groupId>jakarta.annotation</groupId>