Bump bootstrap from 4.2.1 to 4.3.0

[dependabot-preview[bot]]

Bumps bootstrap from 4.2.1 to 4.3.0.

Release notes

*Sourced from [bootstrap's releases](https://github.com/twbs/bootstrap/releases).* > ## v4.3.0 > ### Highlights > > - **New:** Added `.stretched-link` utility to make any anchor the size of it's nearest `position: relative` parent, perfect for entirely clickable cards! > - **New:** Added `.text-break` utility for applying `word-break: break-word` > - **New:** Added `.rounded-sm` and `.rounded-lg` for small and large `border-radius`. > - **New:** Added `.modal-dialog-scrollable` modifier class for scrolling content _within_ a modal. > - **New:** Added responsive `.list-group-horizontal` modifier classes for displaying list groups as a horizontal row. > - **Improved:** Reduced our compiled CSS by using `null` for variables that by default inherit their values from other elements (e.g., `$headings-color` was `inherit` and is now `null` until you modifier it in your custom CSS). > - **Improved:** Badge focus styles now match their `background-color` like our buttons. > - **Fixed:** Silenced bad selectors in our JS plugins for the `href` HTML attribute to avoid JavaScript errors. Please try to use [valid selectors](https://www.w3.org/TR/CSS21/syndata.html#value-def-identifier) or the `data-target` HTML attribute/`target` option where available. > - **Fixed:** Reverted v4.2.1's change to the breakpoint and grid container Sass maps that blocked folks from upgrading when modifying those default variables. > - **Fixed:** Restored `white-space: nowrap` to `.dropdown-toggle` (before v4.2.1 it was on all `.btn`s) so carets don't wrap to new lines. > - **Deprecated:** `img-retina`, `invisible`, `float`, and `size` mixins are now deprecated and will be removed in v5. > > ### Links > - [Read the full ship list](https://github-redirect.dependabot.com/twbs/bootstrap/issues/27893) > - [Review the project board](https://github.com/twbs/bootstrap/projects/16)

Commits

- [`1ded0d6`](https://github.com/twbs/bootstrap/commit/1ded0d6a4eefb7daca62c44e4e735aec200f0b6f) Release v4.3.0 ([#28228](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28228)) - [`3aa0770`](https://github.com/twbs/bootstrap/commit/3aa0770b711f69c4dcf5858b8913794e81b32d80) docs snippets: a few more minor tweaks ([#28225](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28225)) - [`adf16da`](https://github.com/twbs/bootstrap/commit/adf16da25ea554c2a9da814a2492cf18d51e1072) toasts.md: Remove useless `div`s. - [`2bfe581`](https://github.com/twbs/bootstrap/commit/2bfe581eebb0e934961b433de31fcceb1251002e) Remove stray parameter from capture. - [`bbf8b76`](https://github.com/twbs/bootstrap/commit/bbf8b768ef97127b66165ed24496ae6429189a72) Cosmetic changes in snippets. - [`7a9a8db`](https://github.com/twbs/bootstrap/commit/7a9a8db7b1772fab450ce1cb45b1b31bc3147f82) docs: remove `-ms-overflow-style: -ms-autohiding-scrollbar` ([#28220](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28220)) - [`24253b1`](https://github.com/twbs/bootstrap/commit/24253b18e1079b1e3252bd2d9e32c43389c2472a) migration.md: use https. ([#28221](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28221)) - [`545f3fa`](https://github.com/twbs/bootstrap/commit/545f3fa9219bc52dd8c22b582e40d66f135b9044) Prevent text selection in placeholder images ([#28218](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28218)) - [`94acdee`](https://github.com/twbs/bootstrap/commit/94acdee69105cee320f8def204763a9140c84652) Revert "Silence mkdir. ([#28184](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28184))" ([#28209](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28209)) - [`6c7dcc6`](https://github.com/twbs/bootstrap/commit/6c7dcc68829d91767e2656fe197d695294d1dece) placeholder.svg: Partially revert the changes from c0e42cb. ([#28216](https://github-redirect.dependabot.com/twbs/bootstrap/issues/28216)) - Additional commits viewable in [compare view](https://github.com/twbs/bootstrap/compare/v4.2.1...v4.3.0)

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[dependabot-preview[bot]]

Superseded by #217.