### Summary

lookup function fails - lookup('ansible.builtin.ini', ...)

Ansible ini is using the function 'readfp'  on Configmap this function was [removed ](https://issues.apache.org/jira/browse/SVN-4899#:~:text=Description,3.12%20(due%20October%202023).) on python 3.12


### Issue Type

Bug Report

### Component Name

ansible.builtin.ini

### Ansible Version

```console
$ ansible --version
ansible [core 2.15.3]
  config file = /home/liss/webnews/pyramid-rt4/ansible/ansible.cfg
  configured module search path = ['/home/liss/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/liss/.local/lib/python3.12/site-packages/ansible
  ansible collection location = /home/liss/webnews/pyramid-rt4/ansible/collections
  executable location = /home/liss/.local/bin/ansible
  python version = 3.12.0rc1 (main, Aug  6 2023, 17:56:34) [GCC 9.4.0] (/usr/bin/python3)
  jinja version = 3.1.2
  libyaml = True
```


### Configuration

```console
# if using a version older than ansible-core 2.12 you should omit the '-t all'
$ ansible-config dump --only-changed -t all
```


### OS / Environment

"Ubuntu 20.04.6 LTS" on WSL

### Steps to Reproduce

- name:
  set_fact:
    planning_service_monitor_consul_token: "{{ lookup('ansible.builtin.ini', 'consul_token', file='/tmp/pyr_tmp', section='Consul', allow_no_value=True) }}"


### Expected Results

Success

### Actual Results

```console
fatal: [localhost]: FAILED! =>
  msg: 'An unhandled exception occurred while running the lookup plugin ''ansible.builtin.ini''. Error was a <class ''AttributeError''>, original message: ''ConfigParser'' object has no attribute ''readfp''. ''ConfigParser'' object has no attribute ''readfp'''
```


### Code of Conduct

- [X] I agree to follow the Ansible Code of Conduct
re:
        default: False
        type: boolean
        description: Flag to indicate if the key supplied is a regexp.
      encoding:
        default: utf-8
        description:  Text encoding to use.
      default:
        description: Return value if the key is not in the ini file.
        default: ''
      case_sensitive:
        description:
          Whether key names read from O(file) should be case sensitive. This prevents
          duplicate key errors if keys only differ in case.
        default: False
        version_added: '2.12'
      allow_no_value:
        description:
        - Read an ini file which contains key without value and without '=' symbol.
        type: bool
        default: False
        aliases: ['allow_none']
        version_added: '2.12'
    seealso:
      - ref: playbook_task_paths
        description: Search paths used for relative files.
"""
EXAMPLES = """
- ansible.builtin.debug: msg="User in integration is {{ lookup('ansible.builtin.ini', 'user', section='integration', file='users.ini') }}"
- ansible.builtin.debug: msg="User in production  is {{ lookup('ansible.builtin.ini', 'user', section='production',  file='users.ini') }}"