fix(deps): update dependency sortablejs to ^1.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sortablejs	^1.15.3 -> ^1.15.6

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Release Notes

SortableJS/Sortable (sortablejs)

v1.15.6

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• Restore pervious text clearing selection behaviour on fallback-enabled sortable lists. Text should be cleared whenever mouse is down on a sortable item, but text inputs within items should still be interactable
• #​2244: Fix issue where multi-drag selection doesn't work on IOS devices

v1.15.5

Compare Source

v1.15.4

Compare Source

• Fix issue where text selection occurs during dragging when fallback is enabled
• Improved support for pointer events
• #​1897: [MultiDrag] Prevent multi-select of non-draggable and filtered items

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