[Scaleway] Fix mismatch default value function namespaces

[Lunik]

SUMMARY

Fix mismatch default value between documentation and argument_spec

Following #5415 and completing #5446

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

scaleway_function_namespace

ADDITIONAL INFORMATION

CI Fails with the new ansible-core version (2.15.0.dev0) with the following error message :

ERROR: plugins/modules/cloud/scaleway/scaleway_function_namespace.py:0:0: doc-default-does-not-match-spec: Argument 'environment_variables' in argument_spec defines default as ({}) but documentation defines default as (None) (0%)
ERROR: plugins/modules/cloud/scaleway/scaleway_function_namespace.py:0:0: doc-default-does-not-match-spec: Argument 'secret_environment_variables' in argument_spec defines default as ({}) but documentation defines default as (None) (0%)

[ansibullbot]

cc @abarbare @remyleone
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[felixfontein]

I already fixed that directly in main: 2b0bebc

[Lunik]

Didn't see that one. You were definitely quicker 😄

[felixfontein]

I noticed it while working on #5461 ;)