Add missing json serialization dep (#5651)

Summary:
Something was presumably only added in buck land.

Pull Request resolved: #5651

Test Plan:
```
./gradlew :sample:assembleDebug
BUILD SUCCESSFUL in 1m 53s
```
 ---
[//]: # (BEGIN SAPLING FOOTER)
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* __->__ #5651
* #5649

Reviewed By: antonk52

Differential Revision: D59629629

Pulled By: passy

fbshipit-source-id: 42979a7c6170b240a3abdd2963c8d5067e25b64e

android/plugins/litho/build.gradle

@@ -37,6 +37,7 @@ android {
         implementation deps.lithoSectionsCore
         implementation deps.lithoWidget
         implementation deps.supportAppCompat
+        implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.1"
         compileOnly deps.jsr305
 
         testImplementation deps.junit