Update dependency react-bootstrap to v1.6.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-bootstrap (source)	1.6.1 -> 1.6.8

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Release Notes

react-bootstrap/react-bootstrap (react-bootstrap)

v1.6.8

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Bug Fixes

• ModalHeader: fix types (#​6735) (54cb179)

v1.6.7

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Bug Fixes

• Popover: fix content prop error (#​6612) (3d1df53)

v1.6.6

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Bug Fixes

• Modal: render aria-describedby on the top level modal element (6dd9e3b)
• Modal: render aria-label on top level modal element (273901f)

v1.6.5

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Bug Fixes

• update react-overlays and @​restart/hooks packages (#​6333) (9654ca2)

v1.6.4

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Bug Fixes

• InputGroup: fix export (#​6060) (4bfc054)

v1.6.3

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Bug Fixes

• Modal: fix children typing (#​6023) (30ceea8)

v1.6.2

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Bug Fixes

• Modal: Fix wrong types on ModalProps (#​6022) (18ef232), closes #​5894
• avoid @​popperjs/core console warning (#​6021) (335f782), closes #​6017

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