Update dependency sortablejs to v1.15.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
sortablejs	1.15.0 → 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

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• #​2410: Further improvements to handling of text selection during drag, to allow text inputs to continue to function within sortable items. Removed the previous nextTick solution which caused text inputs to be noninteractive, and instead have moved the text selection clearing to the actual drag start.

v1.15.4

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• 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

v1.15.3

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• Expose expando value in Sortable.utils
• #​2346: Fix inability to drag in fallback when handle has a shadowRoot
• Include src folder in NPM package

v1.15.2

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• #​2339: Fixes 1.15.1 regression with not being able to add element into start & end of list.

v1.15.1

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• #​2203: Fix multi drag sort event not firing
• #​2263: Only call onDrop on destroy if dragged element inside parent element
• #​1686: Prevent drag item from jumping to end of list if last element has smaller width/height

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