Update grunt-contrib-imagemin to 0.9.1

Upstream changes https://github.com/gruntjs/grunt-contrib-imagemin/compare/v0.4.1...v0.9.1

see #30141


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Update grunt-contrib-compress to 0.12.0

Upstream changes https://github.com/gruntjs/grunt-contrib-compress/compare/f0762ba6e265ec768e65af07fc96512bd8798080...v0.12.0

see #30141


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Update grunt-sass to 0.16.0

Upstream changes https://github.com/sindresorhus/grunt-sass/compare/v0.14.0...v0.16.0

see #30141


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Update grunt-contrib-clean to 0.6.0

Upstream changes https://github.com/gruntjs/grunt-contrib-clean/compare/v0.5.0...v0.6.0

see #30141

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Update grunt-contrib-copy to 0.7.0

Upstream changes https://github.com/gruntjs/grunt-contrib-copy/compare/v0.5.0...v0.7.0

see #30141

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Add `audio`, `video`, and `track` to `$allowedposttags` (KSES).

Props jwenerd, wonderboymusic. 
Fixes #29826.

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Introduce some new template functions for navigation:

 * `get_the_post_navigation()` and `the_post_navigation()` for navigation to the next and previous post.
 * `get_the_posts_navigation() and `the_posts_navigation()` for navigation to the next and previous page of posts.
 * `get_the_pagination()` and `the_pagination()` for paginated navigation between pages of posts. Uses `paginate_links()`.

This reduces the need for themes to define their own sets of navigation functions.

Fixes #29808.
Props obenland.
 

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Update grunt-contrib-uglify to 0.6.0

Upstream changes https://github.com/gruntjs/grunt-contrib-uglify/compare/v0.5.0...v0.6.0

see #30141

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