build: update terser to version 4.3.8

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
terser (source)	dependencies	patch	4.3.2 -> 4.3.8

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Release Notes

terser/terser

v4.3.8

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• Typescript typings fix

v4.3.7

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• Parsing of regex options in the CLI (which broke in v4.3.5) was fixed.
• typescript definition updates

v4.3.6

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(crash hotfix)

v4.3.5

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• Fixed an issue with DOS line endings strings separated by \ and a new line.
• Improved fix for the output size regression related to unused references within the extends section of a class.
• Variable names of anonymous functions (eg: const x = () => { ... } or var func = function () {...}) are now preserved when keep_fnames is true.
• Fixed performance degradation introduced for large payloads in v4.2.0

v4.3.4

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• Fixed a regression where the output size was increased when unused classes were referred to in the extends clause of a class.
• Small typescript typings fixes.
• Comments with @preserve, @license, @cc_on as well as comments starting with /*! and /**! are now preserved by default.

v4.3.3

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• Fixed a problem where parsing template strings would mix up octal notation and a slash followed by a zero representing a null character.
• Started accepting the name async in destructuring arguments with default value.
• Now Terser takes into account side effects inside class extends clauses.
• Added parens whenever there's a comment between a return statement and the returned value, to prevent issues with ASI.
• Stopped using raw RegExp objects, since the spec is going to continue to evolve. This ensures Terser is able to process new, unknown RegExp flags and features. This is a breaking change in the AST node AST_RegExp.

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[filipesilva]

Size regression reported as terser/terser#470

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