Update heading xs line height tokens.jsonc

[juanfelipecr]

updated line height for heading-xs.
line-height-wide: changed from line-height 20 to line-height 18 and
line-height-narrow: changed from line-height 20 to line-height 16

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[ashleynolan]

I don't think line-height-18 currently exists as a global token – would need to be added for this to output as an alias

[pie-design-system-app]

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🚫	❌ PR Title Validation Failed The PR title should follow the same convention used for commits, e.g.: type(scope): TICKET-123 title where TICKET-123 is a valid ticket ID. Note: Ticket IDs cannot be all zeros (e.g. DSW-000 is not allowed). Current title: Update heading xs line height tokens.jsonc
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[jamieomaguire]

we need a changeset file before this can be merged and the tokens metadata change should be a part of this pull request - can perhaps help a little later today