Update dependency react-bootstrap to v1.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-bootstrap (source)	1.6.6 -> 1.6.8

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Release Notes

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

### [`v1.6.8`](https://togithub.com/react-bootstrap/react-bootstrap/releases/tag/v1.6.8) [Compare Source](https://togithub.com/react-bootstrap/react-bootstrap/compare/v1.6.7...v1.6.8) ##### Bug Fixes - **ModalHeader:** fix types ([#​6735](https://togithub.com/react-bootstrap/react-bootstrap/issues/6735)) ([54cb179](https://togithub.com/react-bootstrap/react-bootstrap/commit/54cb179f43e7fe34f101b80a4c6c70186bb2d7f7)) ### [`v1.6.7`](https://togithub.com/react-bootstrap/react-bootstrap/releases/tag/v1.6.7) [Compare Source](https://togithub.com/react-bootstrap/react-bootstrap/compare/v1.6.6...v1.6.7) ##### Bug Fixes - **Popover:** fix `content` prop error ([#​6612](https://togithub.com/react-bootstrap/react-bootstrap/issues/6612)) ([3d1df53](https://togithub.com/react-bootstrap/react-bootstrap/commit/3d1df53df9b84f1624cd7b78acfe6b3a21ecf937))

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