[Snyk] Upgrade rxjs from 6.5.2 to 6.6.3

[snyk-bot]

Snyk has created this PR to upgrade rxjs from 6.5.2 to 6.6.3.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 7 versions ahead of your current version.
• The recommended version was released a month ago, on 2020-09-06.

Release notes

Package name: rxjs

• 6.6.3 - 2020-09-06

  chore(publish): 6.6.3

• 6.6.2 - 2020-07-31

  chore(publish): 6.6.2

• 6.6.1 - 2020-07-31

  chore(publish): 6.6.1

• 6.6.0 - 2020-07-02
• 6.5.5 - 2020-04-03
• 6.5.4 - 2019-12-27
• 6.5.3 - 2019-09-03
• 6.5.2 - 2019-05-10

from rxjs GitHub release notes

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