build(deps): bump bootstrap from 3.4.0 to 3.4.1 in /frontend

[dependabot[bot]]

Bumps bootstrap from 3.4.0 to 3.4.1.

Release notes

Sourced from bootstrap's releases.

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

Commits

• 68b0d23 Dist
• 2ccfa57 handle # selector for dropdown
• a43077d Bump version to 3.4.1.
• d821de2 Backport sanitize docs from v4.
• 5cd9ef4 Add wdm gem for Windows.
• d6b8501 ES5 fixes.
• 2c8abb9 Add sanitize for tooltips and popovers html content.
• d4129df Bump year.
• 0d64d6a less/modals.less: Add missing semicolon.
• 48c5d7b Use https.
• Additional commits viewable in compare view

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