Bump com.cedarsoftware:json-io from 4.14.2 to 4.15.0 (#235)

Bumps [com.cedarsoftware:json-io](https://github.com/jdereg/json-io) from 4.14.2 to 4.15.0.
- [Changelog](https://github.com/jdereg/json-io/blob/master/changelog.md)
- [Commits](jdereg/json-io@4.14.2...4.15.0)

---
updated-dependencies:
- dependency-name: com.cedarsoftware:json-io
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

java-cfenv/build.gradle

@@ -6,7 +6,7 @@ plugins {
 description = 'Java CF Env Core Library'
 
 dependencies {
-    api 'com.cedarsoftware:json-io:4.14.2'
+    api 'com.cedarsoftware:json-io:4.15.0'
 
     testImplementation "org.springframework.boot:spring-boot-starter-test"
     testImplementation "junit:junit"