Update dependency terser to v5.9.0 - autoclosed

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
terser (source)	5.8.0 -> 5.9.0

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Release Notes

terser/terser

v5.9.0

Compare Source

• Collapsing switch cases with the same bodies (even if they're not next to each other) (#​1070).
• Fix evaluation of optional chain expressions (#​1062)
• Fix mangling collision in ESM exports (#​1063)
• Fix issue with mutating function objects after a second pass (#​1047)
• Fix for inlining object spread { ...obj } (#​1071)
• Typescript typings fix (#​1069)

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