Update terser requirement from ^5.7.2 to ^5.9.0

[dependabot]

Updates the requirements on terser to permit the latest version.

Changelog

Sourced from terser's changelog.

v5.9.0

• 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)

v5.8.0

• Fixed shadowing variables while moving code in some cases (#1065)
• Stop mangling computed & quoted properties when keep_quoted is enabled.
• Fix for mangling private getter/setter and .#private access (#1060, #1068)
• Array.from has a new optimization when the unsafe option is set (#737)
• Mangle/propmangle let you generate your own identifiers through the nth_identifier option (#1061)
• More optimizations to switch statements (#1044)

v5.7.2

• Fixed issues with compressing functions defined in global_defs option (#1036)
• New recipe for using Terser in gulp was added to RECIPES.md (#1035)
• Fixed issues with ?? and ?. (#1045)
• Future reserved words such as package no longer require you to disable strict mode to be used as names.
• Refactored huge compressor file into multiple more focused files.
• Avoided unparenthesized in operator in some for loops (it breaks parsing because of for..in loops)
• Improved documentation (#1021, #1025)
• More type definitions (#1021)

v5.7.1

• Avoided collapsing assignments together if it would place a chain assignment on the left hand side, which is invalid syntax (a?.b = c)
• Removed undefined from object expansions ({ ...void 0 } -> {})
• Fix crash when checking if something is nullish or undefined (#1009)
• Fixed comparison of private class properties (#1015)
• Minor performance improvements (#993)
• Fixed scope of function defs in strict mode (they are block scoped)

v5.7.0

• Several compile-time evaluation and inlining fixes
• Allow reduce_funcs to be disabled again.
• Add spidermonkey options to parse and format (#974)
• Accept {get = "default val"} and {set = "default val"} in destructuring arguments.
• Change package.json export map to help require.resolve (#971)
• Improve docs
• Fix export default of an anonymous class with extends

v5.6.1

... (truncated)

Commits

• 3202410 5.9.0
• dbeb358 update changelog
• 8430c66 collapsing switch cases with same bodies, when not lined in a row (#1070)
• 8dea529 Fix compress/eval of optional chains (#1062)
• 38bef40 Fix collisions between original property and mangled property (#1063)
• 0479921 fix: functions may be compressed mistakenly if passes=2 (#1047)
• c8fa225 Fix inlining object spread properties (#1071)
• c4fcdcc Fix missing nth_identifier default in minify() (#1069)
• d88d610 5.8.0
• 86ea74d update changelog
• Additional commits viewable in compare view

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