chore: Bump version to 6.0.15

[rb-union]

Bump version to 6.0.15 PR:

• https://github.com/linuxdeepin/deepin-editor/pull/266

Log: Bump version to 6.0.15

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rb-union

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[rb-union]

/review @starhcq

[github-actions[bot]]

TAG Bot

TAG: 6.0.15 EXISTED: no DISTRIBUTION: unstable