Bump org.openapitools:jackson-databind-nullable from 0.2.4 to 0.2.6 (#62)

Bumps [org.openapitools:jackson-databind-nullable](https://github.com/OpenAPITools/jackson-databind-nullable) from 0.2.4 to 0.2.6.
- [Release notes](https://github.com/OpenAPITools/jackson-databind-nullable/releases)
- [Commits](OpenAPITools/jackson-databind-nullable@v0.2.4...v0.2.6)

---
updated-dependencies:
- dependency-name: org.openapitools:jackson-databind-nullable
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 spring-boot = "3.0.2"
 spring-dependency-management = "1.1.4"
 openapi-generator = "6.2.1"
-openapi-tools = "0.2.4"
+openapi-tools = "0.2.6"
 swagger = "2.2.8"
 swagger-request-validator = "2.39.0"
 jakarta-validation = "3.0.2"