fix: unmapped anytype

Author: efcasado

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElixirClientCodegen.java

@@ -226,6 +226,7 @@ public ElixirClientCodegen() {
         typeMapping.put("date", "Date.t");
         typeMapping.put("date-time", "DateTime.t");
         // other
+        typeMapping.put("AnyType", "any()");
         typeMapping.put("ByteArray", "binary()");
         typeMapping.put("DateTime", "DateTime.t");
         typeMapping.put("UUID", "String.t");