Key types have a separate config schema, see for reference: https://git.drupalcode.org/project/key/-/blob/8.x-1.x/config/schema/key....
Add config schema for key.type.deepl_api_key
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2.3
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The merge request adds config schema for key.type.deepl_api_key
Issue #3542954: Add config schema for key.type.deepl_api_key
Thx - looks fine for me.