Update dependency popper.js to v2.11.8

[renovate]

This PR contains the following updates:

Package	Update	Change
popper.js (source)	patch	2.11.0 -> 2.11.8

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Release Notes

popperjs/popper-core (popper.js)

v2.11.8: @​popperjs/core v2.11.8

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v2.11.7: @​popperjs/core@2.11.7

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Bug Fixes

• fix: Use correct window to get the devicePixelRatio #​2229

v2.11.6

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Bug Fixes

• fix: position in Safari when pinch-zooming using fixed strategy

  • Adapted from https://github.com/floating-ui floating-ui/floating-ui#1121

• fix: avoid Chrome DevTools warning about userAgent usage

v2.11.5

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Bug Fixes

• fix(types): Constrain Modifier Options to same type as Options in ModifierArguments #​1598

v2.11.4

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Fixes

• Fixed an issue with the postinstall script

v2.11.3

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Bug Fixes

• Fixes a placement issue that is caused when the starting offset parent element is inside shadow DOM. (#​1535)

• Positioning using strategy fixed when inside a containing block (#​1579)

v2.11.2: @​popperjs/core@v2.11.2

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v2.11.1: @​popperjs/core@v2.11.2

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Note: 2.11.1 has a wrong dependency in its package.json, 2.11.2 was released to fix it

Bug Fixes

• Round computed offsets after all the modifiers math is executed (#​1418)

• Fix regression with detection of clipping boundaries (#​1478)

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