Update dependency bootstrap to v3.4.1 [SECURITY]

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
bootstrap	dependencies	patch	3.4.0 -> 3.4.1	homepage, source

GitHub Vulnerability Alerts

CVE-2019-8331

In Bootstrap 4 before 4.3.1 and Bootstrap 3 before 3.4.1, XSS is possible in the tooltip or popover data-template attribute. For more information, see: https://blog.getbootstrap.com/2019/02/13/bootstrap-4-3-1-and-3-4-1/

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Release Notes

twbs/bootstrap

### [`v3.4.1`](https://togithub.com/twbs/bootstrap/releases/v3.4.1) [Compare Source](https://togithub.com/twbs/bootstrap/compare/v3.4.0...v3.4.1) - **Security:** Fixed an XSS vulnerability (CVE-2019-8331) in our tooltip and popover plugins by implementing a new HTML sanitizer - Handle bad selectors (`#`) in `data-target` for Dropdowns - Clarified tooltip selector documentation - Added support for NuGet contentFiles

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