Update dependency terser to v5.3.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
terser (source)	devDependencies	minor	5.2.1 -> 5.3.8

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Release Notes

terser/terser

v5.3.8

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• Restore node 13 support

v5.3.7

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Hotfix release, fixes package.json "engines" syntax

v5.3.6

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• Fixed parentheses when outputting ?? mixed with || and &&
• Improved hygiene of the symbol generator

v5.3.5

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• Avoid moving named functions into default exports.
• Enabled transform() for chain expressions. This allows AST transformers to reach inside chain expressions.

v5.3.4

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• Fixed a crash when hoisting (with hoist_vars) a destructuring variable declaration

v5.3.3

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• source-map library has been updated, bringing memory usage and CPU time improvements when reading input source maps (the SourceMapConsumer is now WASM based).
• The wrap_func_args option now also wraps arrow functions, as opposed to only function expressions.

v5.3.2

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• Prevented spread operations from being expanded when the expanded array/object contains getters, setters, or array holes.
• Fixed very slow self-recursion in some cases of removing extraneous parentheses from + operations.

v5.3.1

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• An issue with destructuring declarations when pure_getters is enabled has been fixed
• Fixed a crash when chain expressions need to be shallowly compared
• Made inlining functions more conservative to make sure a function that contains a reference to itself isn't moved into a place that can create multiple instances of itself.

v5.3.0

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• Fixed a crash when compressing object spreads in some cases
• Fixed compiletime evaluation of optional chains (caused typeof a?.b to always return "object")
• domprops has been updated to contain every single possible prop

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