Fixed to not expose internal function

from FasterXML/jackson-module-kotlin#962

Author: k163377

src/main/kotlin/io/github/projectmapk/jackson/module/kogera/Extensions.kt

@@ -55,10 +55,8 @@ public fun ObjectMapper.registerKotlinModule(
 
 public inline fun <reified T> jacksonTypeRef(): TypeReference<T> = object : TypeReference<T>() {}
 
-/**
- * It is public due to Kotlin restrictions, but should not be used externally.
- */
-public inline fun <reified T> Any?.checkTypeMismatch(): T {
+@PublishedApi
+internal inline fun <reified T> Any?.checkTypeMismatch(): T {
     // Basically, this check assumes that T is non-null and the value is null.
     // Since this can be caused by both input or ObjectMapper implementation errors,
     // a more abstract RuntimeJsonMappingException is thrown.