[PR #8403/572caeaa backport][stable-9] keycloak_client: avoid TypeError if result["attributes"] is a list

[patchback]

This is a backport of PR #8403 as merged into main (572caea).

SUMMARY

This fixes a TypeError in the keycloak_client module.

Longer description:

As sanitize_cr might be executed after normalise_cr, result['attributes'] can be of type list and we run into:

TypeError: list indices must be integers or slices, not str

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

keycloak_client

ADDITIONAL INFORMATION

Full stack trace (keycloak_client.py got renamed to mdz_keycloak_client.py):

Traceback (most recent call last):
  File "/root/.ansible/tmp/ansible-tmp-1716369175.8611605-165495-177683398669149/AnsiballZ_mdz_keycloak_client.py", line 107, in <module>
    _ansiballz_main()
  File "/root/.ansible/tmp/ansible-tmp-1716369175.8611605-165495-177683398669149/AnsiballZ_mdz_keycloak_client.py", line 99, in _ansiballz_main
    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAMS)
  File "/root/.ansible/tmp/ansible-tmp-1716369175.8611605-165495-177683398669149/AnsiballZ_mdz_keycloak_client.py", line 47, in invoke_module
    runpy.run_module(mod_name='ansible.modules.mdz_keycloak_client', init_globals=dict(_module_fqn='ansible.modules.mdz_keycloak_client', _modlib_path=modlib_path),
  File "/usr/lib/python3.10/runpy.py", line 224, in run_module
    return _run_module_code(code, init_globals, run_name, mod_spec)
  File "/usr/lib/python3.10/runpy.py", line 96, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "/usr/lib/python3.10/runpy.py", line 86, in _run_code
    exec(code, run_globals)
  File "/tmp/ansible_mdz_keycloak_client_payload_uw8ct1px/ansible_mdz_keycloak_client_payload.zip/ansible/modules/mdz_keycloak_client.py", line 999, in <module>
  File "/tmp/ansible_mdz_keycloak_client_payload_uw8ct1px/ansible_mdz_keycloak_client_payload.zip/ansible/modules/mdz_keycloak_client.py", line 956, in main
  File "/tmp/ansible_mdz_keycloak_client_payload_uw8ct1px/ansible_mdz_keycloak_client_payload.zip/ansible/modules/mdz_keycloak_client.py", line 779, in sanitize_cr
TypeError: list indices must be integers or slices, not str