Update sortablejs to the latest version 🚀

The dependency sortablejs was updated from `1.7.0` to `1.8.0`.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

Release Notes for v1.8.0 - Major fixes

(#869, #592, #1358, #1119, #1378, etc): Dragover revamp, added options direction, swapThreshold, invertSwap, and invertedSwapThreshold. Read more. Resolved many of the issues where sorting is "not realistic". Grid-style sorting should work as well.
#1373: Autoscroll revamp, added option bubbleScroll, and better cross-browser compatibility
#1303: dragoverBubble for fallback
Bubbling of dragover event will only be stopped when element is inserted into a sortable if dragoverBubble=false
Automatic detection for pointer event support
#1389: Touch delay fix on mobile
#1382: Firefox event path fix
Cloning fixes
Pull/Put function fixes
#1352: Saving on both Sortables if dragged from one to another
- get and set don't both need to be defined to work properly
#1276 : Native Drag and Drop ghost fix
Firefox: prevent selection when dragging
(#1409, #1323, #1095, #1204, #1087): Added onChange event
Changed when dragstart and dragstarted are fired in fallback to match native HTML
Made pointer events mutually exclusive with mouse and touch events, to prevent duplicate event firing
#1151: Added easing option for animation easing
#1184: Click event no longer fired on drop when using fallback
#1404: Fixed ghost element dimensions
#1123: Ghost element is relative to containing block (prevents unwanted ghost element offset when using CSS translate)
#1301: Ghost element adheres to CSS scaling
(#1093, #1236, #1054, #1214): Added removeCloneOnHide option
#1321: Much better support for nested sortables
#1305: Made it easier to add items to empty sortables with emptyInsertThreshold option
#1416: Solidified pull/put behavior. Pull/Put are false by default when dealing with different groups, but true by default when dealing with the same group. They can be overridden in both cases.
#1079: The ghostClass that is applied is the target sortable's ghostClass, not that of the source sortable
Many bug fixes

Commits

The new version differs by 83 commits.

629872b 1.8.0
b7473ac Merge branch 'master' of https://github.com/SortableJS/Sortable
97b5a03 migration to gulp
ad9efbd fixed ghostEl dimensions
6e99cb3 CDN
f157979 1.8.0-rc1
84d6358 Fix JSBins
113944e fix clone issue
93b9912 undo 1d2beb514713f49840491bc94f42f07f8623b89e bc detects touch on PC
073a574 fixed clone rootEl mismatch and removed lastPullMode
4a18d9a Merge pull request #1382 from saloonio/dev-firefoxShadowRoot
4235f3a Merge pull request #1333 from Sapphire2k/master
afcd073 Updated links
9ae38d1 Merge branch 'master' of https://github.com/RubaXa/Sortable
489ec1e fixed owner detection; pull/put allow if same group

There are 83 commits in total.

See the full diff

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