build(deps): bump org.openapitools:jackson-databind-nullable

Bumps [org.openapitools:jackson-databind-nullable](https://github.com/OpenAPITools/jackson-databind-nullable) from 0.2.7 to 0.2.8.
- [Release notes](https://github.com/OpenAPITools/jackson-databind-nullable/releases)
- [Commits](OpenAPITools/jackson-databind-nullable@v0.2.7...v0.2.8)

---
updated-dependencies:
- dependency-name: org.openapitools:jackson-databind-nullable
  dependency-version: 0.2.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -3,7 +3,7 @@ java = "21"
 spring-boot = "3.5.6"
 spring-dependency-management = "1.1.7"
 openapi-generator = "7.16.0"
-openapi-tools = "0.2.7"
+openapi-tools = "0.2.8"
 swagger = "2.2.39"
 swagger-request-validator = "2.45.1"
 jakarta-validation = "3.1.1"