Kyo Nagashima

The default CSS syntax file was [updated][1] in Vim 9.0. So, vim-css3-syntax should be updated as well. [1]: https://github.com/vim/vim/commit/2286304cdbba53ceb52b3ba2ba4a521b0a2f8d0f#diff-1e3757cc6164abb85a230811ca84318902d3f4afabc98b2f6da84983faa12f78

Some CSS functions not highlighted correctly

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- [ ] `invert()` - [ ] `running()` - [ ] `element()` - [ ] `fit-content()` - [ ] `inset()` - [ ] `circle()` - [ ] `ellipse()` - [...