Bump assets/vendor/bootstrap from `8fa0d30` to `9894000`

Bumps assets/vendor/bootstrap from 8fa0d30 to 9894000.

Commits

• 9894000 Remove the now unused docs-search.html partial (#29799)
• 76fd85b Bump terser from 4.4.0 to 4.4.1 (#29786)
• 159aac7 Bump autoprefixer from 9.7.2 to 9.7.3 (#29787)
• 9a78dd3 Bump eslint from 6.7.1 to 6.7.2 (#29784)
• e1833ce Improve wrapping and hit area of accordion example titles (#29782)
• d7203ba Fix breadcrumb spacing with whitespace (#29745)
• 1dc3901 docs: $enable-rfs is true by default (#29766)
• 37d97c9 Fix dart Sass compatibility for subtract (#29763)
• 0964a88 Fix dart Sass compatibility (#29755)
• 4de4874 Change deprecated html tags to text decoration classes (#29604)
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