Bump io.spring.nullability (#230)

Bumps the development-dependencies group with 1 update in the / directory: [io.spring.nullability](https://github.com/spring-gradle-plugins/nullability-plugin).


Updates `io.spring.nullability` from 0.0.12 to 0.0.13
- [Release notes](https://github.com/spring-gradle-plugins/nullability-plugin/releases)
- [Commits](spring-gradle-plugins/nullability-plugin@v0.0.12...v0.0.13)

---
updated-dependencies:
- dependency-name: io.spring.nullability
  dependency-version: 0.0.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

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build.gradle

@@ -7,7 +7,7 @@ plugins {
 	id 'base'
 	id 'io.spring.dependency-management' version '1.1.7'
 	id 'io.spring.javaformat' version "${javaFormatVersion}"
-	id 'io.spring.nullability' version '0.0.12' apply false
+	id 'io.spring.nullability' version '0.0.13' apply false
 }
 
 description = 'Spring Functions Catalog'