fix(deps): pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@rails/webpacker	dependencies	pin	>=5.4.3 -> 5.4.3
autoprefixer	devDependencies	pin	>=10.3.4 -> 10.3.4
axios (source)	dependencies	pin	>=0.21.4 -> 0.21.4
css-loader	devDependencies	pin	>=5.2.6 -> 5.2.6
cssnano	devDependencies	pin	>=4.1.11 -> 4.1.11
postcss-cssnext (source)	devDependencies	pin	>=3.1.1 -> 3.1.1
postcss-import	devDependencies	pin	>=14.0.2 -> 14.0.2
postcss-loader	devDependencies	pin	>=5.3.0 -> 5.3.0
sugarss	devDependencies	pin	>=3.0.3 -> 3.0.3
vue	dependencies	pin	>=2.6.14 -> 2.6.14
vue-loader	dependencies	pin	>=16.3.1 -> 16.3.1
vue-template-compiler	dependencies	pin	>=2.6.14 -> 2.6.14
webpack-dev-server	devDependencies	pin	>=4.2.1 -> 4.2.1

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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