build(deps): bump io.github.java-diff-utils:java-diff-utils

Bumps [io.github.java-diff-utils:java-diff-utils](https://github.com/java-diff-utils/java-diff-utils) from 4.17 to 4.18.
- [Release notes](https://github.com/java-diff-utils/java-diff-utils/releases)
- [Changelog](https://github.com/java-diff-utils/java-diff-utils/blob/master/CHANGELOG.md)
- [Commits](java-diff-utils/java-diff-utils@java-diff-utils-parent-4.17...java-diff-utils-parent-4.18)

---
updated-dependencies:
- dependency-name: io.github.java-diff-utils:java-diff-utils
  dependency-version: '4.18'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -16,7 +16,7 @@ openapi-processor-api = { module = "io.openapiprocessor:openapi-processor-api",
 openapi-parser-bom = { module = "io.openapiprocessor:openapi-parser-bom", version.ref = "parser" }
 openapi-parser-parser = { module = "io.openapiprocessor:openapi-parser" }
 io-jackson = { module = "io.openapiprocessor:io-jackson" }
-diff = { module = "io.github.java-diff-utils:java-diff-utils", version = "4.17" }
+diff = { module = "io.github.java-diff-utils:java-diff-utils", version = "4.18" }
 
 logback = "ch.qos.logback:logback-classic:1.6.5"