fix: update dependency core-js to ^2.6.9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
core-js	dependencies	minor	^2.5.0 -> ^2.6.9

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Release Notes

zloirock/core-js

v2.6.9

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• Some fixes and improvements of the postinstall script like support npm color config (#​556) or adding support of ADBLOCK env variable

v2.6.8

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• Added a workaround of a strange npx bug on postinstall, #​551

v2.6.7

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• Added one more workaround of alternative not completely correct Symbol polyfills, #​550, #​554

v2.6.6

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• Fixed IE8- non-enumerable properties support in Object.{ assign, entries, values }, #​541
• Fixed support of primitives in Object.getOwnPropertySymbols in Chrome 38 / 39, #​539
• Show a message on postinstall

v2.6.5

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• Fixed buggy String#padStart and String#padEnd mobile Safari implementations, #​414.

v2.6.4

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• Added a workaround against crushing an old IE11.0.9600.16384 build, #​485.

v2.6.3

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• Added a workaround for babel-minify bug, #​479

v2.6.2

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• Fixed handling of $ in String#replace, #​471

v2.6.1

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• Fixed an issue with minified version, #​463, #​465

v2.6.0

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• Add direct .exec calling to RegExp#{@​@​replace, @​@​split, @​@​match, @​@​search}. Also, added fixes for RegExp#exec method. #​428, #​435, #​458, thanks @​nicolo-ribaudo.

v2.5.7

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• Get rid of reserved variable name final, related #​400

v2.5.6

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• Forced replace native Promise in V8 6.6 (Node 10 and Chrome 66) because of a bug with resolving custom thenables
• Added a workaround for usage buggy native LG WebOS 2 Promise in microtask implementation, #​396
• Added modern version internal debugging information about used versions

v2.5.5

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• Fix some edge cases of Reflect.set, #​392 and #​393

v2.5.4

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• Fixed one case of deoptimization built-in iterators in V8, related #​377
• Fixed some cases of iterators feature detection, #​368
• Fixed manually entered NodeJS domains issue in Promise, #​367
• Fixed Number.{parseInt, parseFloat} entry points
• Fixed __(define|lookup)[GS]etter__ export in the library version

v2.5.3

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• Fixed calling onunhandledrejectionhandler multiple times for one Promise chain, #​318
• Forced replacement of String#{padStart, padEnd} in Safari 10 because of a bug, #​280
• Fixed Array#@​@​iterator in a very rare version of WebKit, #​236 and #​237
• One more #​345-related fix

v2.5.2

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• MutationObserver no longer used for microtask implementation in iOS Safari because of bug with scrolling, #​339
• Fixed JSON.stringify(undefined, replacer) case in the wrapper from the Symbol polyfill, #​345
• Array() calls changed to new Array() for V8 optimisation

v2.5.1

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• Updated Promise#finally per tc39/proposal-promise-finally#​37
• Optimized usage of some internal helpers for reducing size of shim version
• Fixed some entry points for virtual methods

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