chore: update dependencies and devDependencies

@babel/cli             ^7.12.7  →  ^7.12.10
@babel/core            ^7.12.7  →  ^7.12.10
@babel/preset-env      ^7.12.7  →  ^7.12.11
@coreui/coreui      ^4.0.0-alpha.0  →  ^4.0.0-alpha.1
autoprefixer           ^10.0.2  →   ^10.2.3
copyfiles               ^2.4.0  →    ^2.4.1
cross-env               ^7.0.2  →    ^7.0.3
eslint                 ^7.14.0  →   ^7.18.0
eslint-config-xo       ^0.33.1  →   ^0.34.0
eslint-plugin-unicorn  ^23.0.0  →   ^26.0.1
js-beautify            ^1.13.0  →   ^1.13.4
nodemon                 ^2.0.6  →    ^2.0.7
postcss                 ^8.1.9  →    ^8.2.4
postcss-cli             ^8.3.0  →    ^8.3.1
stylelint              ^13.8.0  →   ^13.9.0

Author: mrholek