Update bootstrap library to 3.4.1

[jvillafanez]

Description

Update library to 3.4.1

Related Issue

https://github.com/owncloud/enterprise/issues/3588

Motivation and Context

How Has This Been Tested?

No special tests other than clicking around. It's unclear where the library is used. The core.json file points to "bootstrap/js/tooltip.js" so I've checked around tooltips: no problems found with this.
Other than that, basic ownCloud functionality works without apparent problems.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[codecov]

Codecov Report

Merging #36344 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master   #36344   +/-   ##
=========================================
  Coverage     64.86%   64.86%           
  Complexity    19775    19775           
=========================================
  Files          1271     1271           
  Lines         74707    74707           
  Branches       1309     1309           
=========================================
  Hits          48455    48455           
  Misses        25866    25866           
  Partials        386      386

Flag	Coverage Δ	Complexity Δ
#javascript	54% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	66.05% <ø> (ø)	19775 <ø> (ø)	⬇️

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