Update dependency org.webjars.bower:popper.js to v2

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.webjars.bower:popper.js (source)	1.16.1 -> 2.11.2

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Release Notes

floating-ui/floating-ui (org.webjars.bower:popper.js)

v2.11.2: @​popperjs/core@v2.11.2

v2.5.4

Bug Fixes

• Added a check that getRootNode is not undefined. (#​1185)

v2.5.3

Bug Fixes

• improve shadow root detection (#​1166)

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