Update all dependencies – drop support for Node.js 12 and 14

[marcomontalbano]

Closes #135

Update all dependencies to the latest available with support to Node.js >= v16.14.
Drop support for Node.js 12 and Node.js 14.

SVGR has been updated to the latest version. Starting from v7 they removed plugin-jsx from the core so you'll need to install it manually.

npm install --save-dev @svgr/plugin-jsx

// .figmaexportrc.js

...

outputters: [
  require('@figma-export/output-components-as-svgr')({
    output: './output/svgr',
    getSvgrConfig: () => ({
      plugins: ['@svgr/plugin-jsx']
    })
  })
]

...