fix(deps): Fix Saber dev not building on Node 13+

[andreasvirkus]

Summary

There's an issue with Node 13.* as described here: ianstormtaylor/superstruct#205 and it seems that superstruct's 0.8.3 fixes this.

Currently, when running saber on Node 13+, the user gets the following error:

[ web | master ] ◉  npm run dev
> [email protected] dev /Users/anc/code/klaus/web
> saber
(node:56177) Warning: require() of ES modules is not supported.
require() of /Users/anc/code/klaus/web/node_modules/superstruct/lib/index.js from /Users/anc/code/klaus/web/node_modules/saber/dist/utils/validateConfig.js is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename index.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /Users/anc/code/klaus/web/node_modules/superstruct/package.json.
[error] Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: /Users/anc/code/klaus/web/node_modules/superstruct/lib/index.js
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1163:13)

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI/CSS related code, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• Briefly describing what this PR does in the title in Angular Commit Message Conventions, e.g. fix: rebuild when a page is added

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Other information:

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