fix(deps): update dependency symbol-observable to v3

[mesosphere-renovate]

This PR contains the following updates:

Package	Type	Update	Change
symbol-observable	dependencies	major	2.0.3 -> 3.0.0

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Release Notes

blesh/symbol-observable

v3.0.0

Compare Source

Bug Fixes

• TypeScript: Symbol.observable is now unique symbol. (2ef1476), closes #​41
• TypeScript: Symbol[Symbol.observable] is no longer incorrectly defined (fe4301f)

BREAKING CHANGES

• TypeScript: Older versions of @types/node will clash with this, because @types/node incorrectly defined Symbol.observable has symbol and not unique symbol. Update to @types/node@14.14.6 or higher.

2.0.3 (2020-09-30)

Bug Fixes

• package.json ponyfill.d.ts added to package (b25f5bf)

2.0.2 (2020-09-29)

Bug Fixes

• TypeScript ponyfill types added (10d2ec8)

2.0.1 (2020-09-04)

Bug Fixes

• package.json: es/ponyfill.js no longer typoed (ad2c079)
• Resolve issues in environments with frozen Symbol (2323882)

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