fix: Remove extra hyphen out of the core-metadata.yaml

[judehung]

Three map[string]any fields are recently added into DTOs:

1. tags field of Device DTO
2. properties field of Device DTO
3. properties field of ProvisionWatcher

The proper way to show map[string]any in swagger is like following:

tags:
  tag1:
    field1: "field1Value"
    field2: "field2Value"
  tag2:
    field3: "field3Value"
    field4: "field4Value"
    field5: "field5Value"

However, #4375 accidentally add extra hyphens like following:

tags:
  - tag1:
      field1: "field1Value"
      field2: "field2Value"
  - tag2:
      field3: "field3Value"
      field4: "field4Value"
      field5: "field5Value"

Those hyphens should be removed for proper map[string] representation.

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• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
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[sonarqubecloud]

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[cloudxxx8]

LGTM

[cloudxxx8]

I just noticed the commit should start with "docs:", not "fix:"