Update dependency gridstack to v9

This MR contains the following updates:

Package	Type	Update	Change
gridstack (source)	dependencies	major	^8.4.0 -> ^9.1.0

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

gridstack/gridstack.js

v9.1.0

Compare Source

• renamed fitToContent to sizeToContent (API BREAK)
• feat: sizeToContent now supports being boolean|number to limit the height but user can resize past that, unlike maxH.
• feat: resizeToContentParent now on GridStackWidget as well as globally for those widgets that need to resize differently.

v9.0.2

Compare Source

• fix 'resizecontent' event fix not called.
• partial fix #​2427 fitToContent when calling cellHeight()/addWidget()/MakeWidget()

v9.0.1

Compare Source

• fix #​2413 support touchscreen+mouse devices. Thank you @​Ruslan207
• tweak to fitToContent from #​2412. Thank you @​JonSohn

v9.0.0

Compare Source

• feat #​404 added GridStackOptions.fitToContent and GridStackWidget.fitToContent to make gridItems size themselves to their content (no scroll bar), calling GridStack.resizeToContent(el) whenever the grid or item is resized.
• also added new 'resizecontent' event, and resizeToContentCB and resizeToContentParent vars.
• fix #​2406 inf loop when autoPosition after loading into 1 column, then 2.

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