fix(deps): update dependency rxjs to ^6.6.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rxjs (source)	^6.3.3 -> ^6.6.7

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

reactivex/rxjs (rxjs)

v6.6.7

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v6.6.6

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v6.6.4

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v6.6.3

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v6.6.2

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v6.6.1

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v6.6.0

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v6.5.5

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v6.5.4

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v6.5.3

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v6.5.2

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v6.5.1

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v6.5.0

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v6.4.0

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Configuration

📅 Schedule: Branch creation - "on the 1st through 7th day of the month" in timezone America/Los_Angeles, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: npm-import-stats/package-lock.json