Update [Bootstrap 4] library from 4.4.1 to 4.5.0

Bootstrap v4.5.0 was released

https://github.com/twbs/bootstrap/releases/tag/v4.5.0

Highlights

• New interaction utilities. Quickly set user-select with the new utilities and Sass map.
  a new variable for that
  $user-selects: all, auto, none !default;
• New Reboot style for pointer cursors. We now include a role="button" selector in Reboot to set cursor: pointer on non- element buttons.
• Examples are now downloadable. We've added a script to zip up and offer all our Examples as their own download from the docs.
• Saved ~5% from the compressed minified JS builds.
• Added guidance to our docs for how to work around our longstanding input group rounded corner bug.
• Redesigned docs homepage and navbar to increment us towards v5's new docs design.
• Deprecated bg-gradient-variant mixin as it's being removed in v5.
• Updated to jQuery v3.5.1, Jekyll v4, and dropped Node.js < 10 for development.

#29946: Added new variable for padding on dropdown header
Noticed two new Variables
$dropdown-header-padding: $dropdown-padding-y $dropdown-item-padding-x !default;
#30183: Remove unnecessary reduce motion when $enable-transition: false
#30515: Add .card-footer color
#30594: Deprecate bg-gradient-variant mixin
if you had been using the bg-gradient-variant mixin you may look other ways to replace it in your sub theme.

Dependencies

• Updated jQuery to v3.5.1
• Replaced bundlesize with bundlewatch
• Updated to Jekyll v4
• Drop Node.js < 10
• Misc devDependencies updates

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When we run "npm install" in our custom themes
The new Bootstrap v4.5.0 will be used on gulp compile.
And change bootstrap-variables.scss file in Varbase BS4 and VARTHEME_BS4_SUBTHEME

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If you want to update your custom Vartheme BS4 Sub-Theme to use Bootstrap v4.5.0
you must change bootstrap-variables.scss file to have the list of variables from
https://github.com/twbs/bootstrap/blob/v4.5.0/scss/_variables.scss
Basic copy and past will do it

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Make sure that you keep $enable-responsive-font-sizes: true !default;
and other your custom changed variables
Vartheme BS4 Default changes are at
https://github.com/Vardot/vartheme_bs4/blob/8.x-6.x/VARTHEME_BS4_SUBTHEM...