Bump org.json:json in /data-prepper-plugins/avro-codecs (#6898)

Bumps [org.json:json](https://github.com/douglascrockford/JSON-java) from 20251224 to 20260522.
- [Release notes](https://github.com/douglascrockford/JSON-java/releases)
- [Changelog](https://github.com/stleary/JSON-java/blob/master/docs/RELEASES.md)
- [Commits](stleary/JSON-java@2025122...2026052)

---
updated-dependencies:
- dependency-name: org.json:json
  dependency-version: '20260522'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

data-prepper-plugins/avro-codecs/build.gradle

@@ -13,7 +13,7 @@ dependencies {
     implementation libs.parquet.common
     implementation 'software.amazon.awssdk:s3'
     implementation 'software.amazon.awssdk:apache-client'
-    testImplementation 'org.json:json:20251224'
+    testImplementation 'org.json:json:20260522'
     testImplementation project(':data-prepper-plugins:common')
     testImplementation project(':data-prepper-test:test-event')
 }