Update dependency terser-webpack-plugin to v2.3.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
terser-webpack-plugin	2.3.5 -> 2.3.8

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Release Notes

webpack-contrib/terser-webpack-plugin

v2.3.8

Compare Source

2.3.8 (2020-08-12)

Chore

• update serialize-javascript

v2.3.7

Compare Source

2.3.7 (2020-06-03)

Bug Fixes

• security problem (#​258) (9954ad5)

v2.3.6

Compare Source

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