[BUG] [CSharp-netcore] model.vars.dataType is not equivalent to model.vars.items.dataType when you have a List of Dictionary

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

When I have a model with a property that is a List of Dictionary<x,y> the generated code is public List<Dictionary> MyProperty {get; set;} instead of public List<Dictionary<x,y>> MyProperty {get;set;} causing compilation issues (Using the generic type 'Dictionary<TKey, TValue>' requires 2 type arguments) . I have debugged the model and I noticed that model.vars.dataType is incorrect but model.vars.items.dataType is correct:

...
     "name" : "ApplicationLayout",
    "classname" : "ApplicationLayout",
    "classVarName" : "ApplicationLayout",
    "modelJson" : "{\r\n  \"type\" : \"object\",\r\n  \"properties\" : {\r\n    \"elements\" : {\r\n      \"type\" : \"array\",\r\n      \"items\" : {\r\n        \"$ref\" : \"#/components/schemas/ApplicationLayoutElements\"\r\n      }\r\n    },\r\n    \"label\" : {\r\n      \"type\" : \"string\"\r\n    },\r\n    \"options\" : {\r\n      \"type\" : \"object\",\r\n      \"additionalProperties\" : { }\r\n    },\r\n    \"rule\" : {\r\n      \"$ref\" : \"#/components/schemas/ApplicationLayout_rule\"\r\n    },\r\n    \"scope\" : {\r\n      \"type\" : \"string\"\r\n    },\r\n    \"type\" : {\r\n      \"type\" : \"string\"\r\n    }\r\n  }\r\n}",
    "dataType" : "Object",
    "classFilename" : "ApplicationLayout",
    "isAlias" : false,
    "isString" : false,
    "isInteger" : false,
    "isLong" : false,
    "isNumber" : false,
    "isNumeric" : false,
    "isFloat" : false,
    "isDouble" : false,
    "isDate" : false,
    "isDateTime" : false,
    "isDecimal" : false,
    "isShort" : false,
    "isUnboundedInteger" : false,
    "isPrimitiveType" : false,
    "isBoolean" : false,
    "additionalPropertiesIsAnyType" : false,
    "vars" : [ {
      "openApiType" : "array",
      "baseName" : "elements",
      "getter" : "getElements",
      "setter" : "setElements",
      "dataType" : "List<Dictionary>", <-- INCORRECT
      "datatypeWithEnum" : "List<Dictionary>", <-- INCORRECT
      "name" : "Elements",
      "defaultValueWithParam" : " = data.elements;",
      "baseType" : "List",
      "containerType" : "array",
      "jsonSchema" : "{\r\n  \"type\" : \"array\",\r\n  \"items\" : {\r\n    \"$ref\" : \"#/components/schemas/ApplicationLayoutElements\"\r\n  }\r\n}",
      "exclusiveMinimum" : false,
      "exclusiveMaximum" : false,
      "required" : false,
      "deprecated" : false,
      "hasMoreNonReadOnly" : false,
      "isPrimitiveType" : true,
      "isModel" : false,
      "isContainer" : true,
      "isString" : false,
      "isNumeric" : false,
      "isInteger" : false,
      "isShort" : false,
      "isLong" : false,
      "isUnboundedInteger" : false,
      "isNumber" : false,
      "isFloat" : false,
      "isDouble" : false,
      "isDecimal" : false,
      "isByteArray" : false,
      "isBinary" : false,
      "isFile" : false,
      "isBoolean" : false,
      "isDate" : false,
      "isDateTime" : false,
      "isUuid" : false,
      "isUri" : false,
      "isEmail" : false,
      "isNull" : false,
      "isFreeFormObject" : false,
      "isAnyType" : false,
      "isArray" : true,
      "isMap" : false,
      "isEnum" : false,
      "isReadOnly" : false,
      "isWriteOnly" : false,
      "isNullable" : false,
      "isSelfReference" : false,
      "isCircularReference" : false,
      "isDiscriminator" : false,
      "items" : {
        "openApiType" : "object",
        "baseName" : "Elements",
        "getter" : "getElements",
        "setter" : "setElements",
        "dataType" : "Dictionary<string, Object>", <-- CORRECT
        "datatypeWithEnum" : "Dictionary<string, Object>", <-- CORRECT
        "name" : "Elements",
        "defaultValueWithParam" : " = data.Elements;",
        "baseType" : "Dictionary",
        "containerType" : "map",
        "jsonSchema" : "{\r\n  \"type\" : \"object\",\r\n  \"additionalProperties\" : true\r\n}",
...

openapi-generator version

6.2.0

OpenAPI declaration file content or url

Generation Details

openapi-generator-cli generate -g csharp-netcore -i input.yaml

Steps to reproduce

1- Use the spec provided above
2- Run openapi-generator-cli generate -g csharp-netcore -i input.yaml
3- Verify the generated code

Related issues/PRs

Suggest a fix

It seems that model.vars.items.dataType looks fine so I'd suggest porting the same logic to model.vars.dataType

Start by running openapi-generator-cli generate -g csharp-netcore -i input.yaml with the supplied OpenAPI spec and inspect the generated property type. Trace how the generator represents the array item type versus the container data type. Done means the generated property uses List<Dictionary<string, Object>> and compiles without the missing type-argument error.