Update dependencies

[JohnAlbin]

Updates version of PostCSS and webpack loaders

[productdevbook]

@phated

[Asim-Tahir]

#25 as stated
postcss must be >=8.2.10

[twhitbeck]

yo @JohnAlbin @phated can we get an update on why this hasn't been merged?

[jkklapp]

Bump

[patrick-mcdougle]

Can we also add the peerDependency that yarn 2 needs to prevent these warnings:

➤ YN0002: │ @storybook/addon-postcss@npm:2.0.0 doesn't provide webpack (pb2910), requested by css-loader
➤ YN0002: │ @storybook/addon-postcss@npm:2.0.0 doesn't provide webpack (pec374), requested by postcss-loader
➤ YN0002: │ @storybook/addon-postcss@npm:2.0.0 doesn't provide webpack (pe4518), requested by style-loader

peerDependencies: {
  webpack: '^4.0.0 || ^5.0.0'
}

Since this package depends on the 3 loaders above which have webpack as peerDependencies and does not provide it, it should forward the peerDependencies on to the next consumer. See yarnpkg/berry#3 for further details.

[Yash-Singh1]

@knightly-bot build this