Bump bundle/syntax-nginx from `52453c0` to `f21506f`
Bump bundle/syntax-nginx from `52453c0` to `f21506f`

Bumps [bundle/syntax-nginx](https://github.com/chr4/nginx.vim) from `52453c0` to `f21506f`.
- [Release notes](https://github.com/chr4/nginx.vim/releases)
- [Commits](https://github.com/chr4/nginx.vim/compare/52453c0a6f745feaa66760bc23e88b72d67cb18b...f21506f8cd9ae8a21bb82fcb67830e5e29d186c5)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
drAlberT/vim-configuration,faktiva/vim-config