Renovate[bot]: Update dependency terser to v5.20.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
terser (source)	5.19.4 -> 5.20.0

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Pre-merge checks

• [ ] Make sure the GitHub Actions tests are passing.

• [ ] Run bin/compare-build-branch.sh locally on this branch and confirm that this PR is not causing unexpected changes to the build. Requirements to run this script: grunt build and nvm.

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Release Notes

terser/terser (terser)

### [`v5.20.0`](https://togithub.com/terser/terser/blob/HEAD/CHANGELOG.md#v5200) [Compare Source](https://togithub.com/terser/terser/compare/v5.19.4...v5.20.0) - Passing `minify()` zero files will now throw a clean exception ([#​1450](https://togithub.com/terser/terser/issues/1450)) - `drop_console` supports passing in an array of `console.*` method names ([#​1445](https://togithub.com/terser/terser/issues/1445)) - New DOM properties from the WebGPU API have been added for use in the property mangler ([#​1436](https://togithub.com/terser/terser/issues/1436)) - Internal code simplification ([#​1437](https://togithub.com/terser/terser/issues/1437))

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[mattyrob]

Local run of bin/compare-build-branch.sh renovate/terser-5.x returned:

Diff results for branch: renovate/terser-5.x
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       0 build-compare.diff