Bump io.spring.nullability:io.spring.nullability.gradle.plugin

Bumps [io.spring.nullability:io.spring.nullability.gradle.plugin](https://github.com/spring-gradle-plugins/nullability-plugin) from 0.0.11 to 0.0.13.
- [Release notes](https://github.com/spring-gradle-plugins/nullability-plugin/releases)
- [Commits](spring-gradle-plugins/nullability-plugin@v0.0.11...v0.0.13)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -42,4 +42,4 @@ io-spring-security-release-plugin = "io.spring.gradle:spring-security-release-pl
 org-springframework-boot-spring-boot-gradle-plugin = { module = "org.springframework.boot:spring-boot-gradle-plugin", version.ref = "org-springframework-boot" }
 io-spring-javaformat-spring-javaformat-checkstyle = "io.spring.javaformat:spring-javaformat-checkstyle:0.0.47"
 io-spring-nohttp-nohttp-checkstyle = "io.spring.nohttp:nohttp-checkstyle:0.0.11"
-spring-nullability = "io.spring.nullability:io.spring.nullability.gradle.plugin:0.0.11"
+spring-nullability = "io.spring.nullability:io.spring.nullability.gradle.plugin:0.0.13"