BUG : allOf does not validate in version 0.13.6

[sjiekak]

If a component contains allOf, then there is no validation against it. It seems there is a regression introduced in version 0.13.6.

Sample

import json

from openapi_core.testing import MockRequest
from openapi_core.validation.request.validators import RequestValidator
from openapi_spec_validator.schemas import read_yaml_file
from openapi_core.shortcuts import create_spec

def test_openapi_core():
    data = json.dumps({
            'a': 15,
            'b': 30
        })

    request = MockRequest("http://localhost:8090", "post", "/validate", data=data)

    spec = create_spec(read_yaml_file("./open_api_0136_bug.yml"))

    validator = RequestValidator(spec)
    result = validator.validate(request)

    assert result.errors, f"{result.errors}"

Contents of open_api_0136_bug .yml

openapi: 3.0.1
info:
  title: all-of bug 0.1.36
  version: 2.0.0
  description:
    Sample to demonstrate all of bug in version 0.1.36

paths:
  /validate:
    post:
      summary: "test"
      description:
        just for the validation
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/FooBar'
        required: true
      responses:
        200:
          description: schema is valid
        400:
          description: schema is invalid
components:
  schemas:
    ### REQUESTS ###

    FooBar:
      allOf:
        - $ref: '#/components/schemas/Foo'
        - $ref: '#/components/schemas/Bar'
      description:
        all of foo and bar
    Foo:
      required:
        - a
      type: object
      properties:
        a:
          $ref: '#/components/schemas/age'
        b:
          $ref: '#/components/schemas/age'
    Bar:
      required:
        - x
      type: object
      properties:
        x:
          $ref: '#/components/schemas/age'
    age:
      minimum: 18
      exclusiveMinimum: false
      type: integer
      description: age. Must be an adult

[p1c2u]

@sjiekak thanks for the report.
Indeed I forgot to make one change for any type unmarshaller. That should be easy to fix.