Drop loader-utils dep

[LukeCarrier]

Instead of require("loader-utils").getOptions(LoaderContext) we should be good with LoaderContext.getOptions(), where LoaderContext is bound to this.

This lets us drop the loader-utils dep, which until 3.2.1 contains a ReDoS vulnerability (CVE-2022-37603).

Note since it is still a transitive dependency (via webpack-v4 and babel-loader), it will still be necessary to add a resolution for it.

[codesandbox[bot]]

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[pmmmwh]

Hi - unfortunately we cannot do this right now as we support Webpack v4. This will be resolved in #851.