Bump bootstrap from 4.3.1 to 4.5.1

[dependabot-preview[bot]]

Bumps bootstrap from 4.3.1 to 4.5.1.

Release notes

Sourced from bootstrap's releases.

v4.5.1

CSS

• #30808: Simplify list-group borders in cards
• #30810: Add z-index to .custom-check to fix their rendering in CSS columns
• #30817: Add border-radius to .card-img-overlay
• #30830: Prevent conflicts with components with classes
• #30922: Fix color on disabled checked state for custom controls
• #30932: Restore word-break: break-word; on .text-break utility.
• #30940: Prevent .row from shrinking in flex containers
• #30957: Nullify custom form states' box-shadow
• #30959: Toasts in IE11
• #30960: Fix IE11 validation tooltip alignment in input groups
• #30965: Improve floating labels example in IE
• #30966: Improve floating labels with Edge and a general refactor
• #30969: Remove duplicated container breakpoints in compiled CSS
• #30999: Revert min-width: 0 on .col due to unforeseen side effects
• #31148: Remove duplicate properties on custom controls
• #31165: Remove backdrop-filter from docs subnav and toasts
• #31339: Add link to view docs pages on GitHub
• #31347: Turn off scroll anchoring for accordions
• #31381: Remove overflow: hidden from toasts

JavaScript

• #30326: Prevent overflowing static backdrop modal animation
• #30936: Add role="dialog" in modals via JavaScript
• #30992: Avoid preventing input event onclick
• #31155: Clear timeout before showing the toast

Build

• #30797: Fix release script docs
• #31011: Updated Babel config
• #31296: Update to Ruby 2.7 and Bundler 2.x

Docs

• #30809: Update docs callout for responsive SVG images
• #30813: Mention Bootstrap Icons in extend/icons.md page
• #30896: Improve wording on Downloads page
• #30897: Prevent skip links from overlapping header in docs
• #30957: Add .card-img-bottom example
• #30973: Update some nav examples by removing .nav-item from .nav-link to be more consistent
• #31070: Fix some broken examples and typos
• #31135: Move color utility callouts to start of page
• #31234: Clean up docs forms for accessibility
• #31344: Mention toasts in the components requiring JavaScript page

v4.5.0

Commits

• 89dc975 Prepare v4.5.1. (#31408)
• e0f89dc Backport #31339 (#31414)
• 30d375b Remove overflow: hidden from toasts (#31381) (#31407)
• 6879a3c Update devDependencies and gems
• d44a1e1 Backport #31344
• 81d3e2b docs(skippy): prevent skip links from overlapping header
• 1abe926 Add unit test for toast to check clearTimeout to have been called (#31298)
• f530ab7 Clear timeout before showing the toast (#31155)
• 0ec2ce4 Update to Ruby 2.7/Bundler 2.x. (#31296)
• cc49a5b Turn off scroll anchoring for accordions (#31347)
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #415.