Update dependency mustache to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mustache	^3.1.0 -> ^4.0.0

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Release Notes

janl/mustache.js

v4.1.0

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Added

• [#​764]: render() now recognizes a config object argument, by [@​pineapplemachine].

Fixed

• [#​764]: Ask custom escape functions to escape all types of values (including numbers), by [@​pineapplemachine].

v4.0.1

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Fixed

• [#​739]: Fix custom delimiters in nested partials, by [@​aielo].

v4.0.0

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Majority of using projects don't have to worry by this being a new major version.

TLDR; if your project manipulates Writer.prototype.parse | Writer.cache directly or uses .to_html(), you probably have to change that code.

This release allows the internal template cache to be customised, either by disabling it completely
or provide a custom strategy deciding how the cache should behave when mustache.js parses templates.

const mustache = require('mustache');

// disable caching
Mustache.templateCache = undefined;

// or use a built-in Map in modern environments
Mustache.templateCache = new Map();

Projects that wanted to customise the caching behaviour in earlier versions of mustache.js were forced to
override internal method responsible for parsing templates; Writer.prototype.parse. In short, that was unfortunate
because there is more than caching happening in that method.

We've improved that now by introducing a first class API that only affects template caching.

The default template cache behaves as before and is still compatible with older JavaScript environments.
For those who wants to provide a custom more sopisiticated caching strategy, one can do that with an object that adheres to the following requirements:

{
  set(cacheKey: string, value: string): void
  get(cacheKey: string): string | undefined
  clear(): void
}

Added

• [#​731]: Allow template caching to be customised, by [@​AndrewLeedham].

Removed

• [#​735]: Remove .to_html(), by [@​phillipj].

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