fix(dependencies): add undeclared dependencies

[paul-soporan]

vue-cli-plugin-vuetify depends on semver, but doesn't declare it as a dependency, which causes Yarn 2 PnP to throw Error: A package is trying to access another package without the second one being listed as a dependency of the first one when used inside a project.

This PR adds semver as a dependency to vue-cli-plugin-vuetify, as well as to @vuetify/cli-plugin-utils (since I've noticed it has the same issue).

This PR preserves the version of semver (^6.3.0) that is declared as a devDependency in the root package.json(I didn't remove it because I'm not sure if it is used anywhere else).

[DRoet]

nice work, I think this also needs the sass-loader (optional peer-deps) and vuetify-loader (not sure if optional) as dependencies

[paul-soporan]

Done.
sass-loader has been added as an optional peer dependency to @vuetify/cli-plugin-utils(

vue-cli-plugins/packages/cli-plugin-utils/index.js

Line 97 in 6f4321d

sassLoaderVersion = semver.major(require('sass-loader/package.json').version)

) and to vue-cli-plugin-vuetify(

vue-cli-plugins/packages/vue-cli-plugin-vuetify/util/helpers.js

Line 51 in 6f4321d

sassLoaderVersion = semver.major(require('sass-loader/package.json').version)

).
vuetify-loader has been added as an optional peer dependency to vue-cli-plugin-vuetify(

vue-cli-plugins/packages/vue-cli-plugin-vuetify/index.js

Line 14 in 6f4321d

const VuetifyLoaderPlugin = require('vuetify-loader/lib/plugin')

).

[DRoet]

LGTM