Bump org.json4s:json4s-ast_2.10 from 3.2.10 to 3.6.12 in /spark/core

Bumps [org.json4s:json4s-ast_2.10](https://github.com/json4s/json4s) from 3.2.10 to 3.6.12.
- [Release notes](https://github.com/json4s/json4s/releases)
- [Commits](json4s/json4s@v3.2.10...v3.6.12)

---
updated-dependencies:
- dependency-name: org.json4s:json4s-ast_2.10
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

spark/core/build.gradle

@@ -72,7 +72,7 @@ sparkVariants {
                 add(variant.configuration('implementation'), "org.apache.avro:avro:1.11.1")
                 add(variant.configuration('implementation'), "log4j:log4j:1.2.17")
                 add(variant.configuration('implementation'), "com.google.code.findbugs:jsr305:2.0.1")
-                add(variant.configuration('implementation'), "org.json4s:json4s-ast_2.10:3.2.10")
+                add(variant.configuration('implementation'), "org.json4s:json4s-ast_2.10:3.6.12")
                 add(variant.configuration('implementation'), "com.esotericsoftware.kryo:kryo:2.21")
                 add(variant.configuration('compileOnly'), "org.apache.hadoop:hadoop-annotations:${project.ext.hadoopVersion}")
                 add(variant.configuration('compileOnly'), "org.codehaus.jackson:jackson-core-asl:${project.ext.jacksonVersion}")