chore(deps): update dependency sockjs to 0.3.20 [security]

[renovate[bot]]

This PR contains the following updates:

Package	Change
sockjs	0.3.19 -> 0.3.20

GitHub Vulnerability Alerts

CVE-2020-7693

Incorrect handling of Upgrade header with the value websocket leads in crashing of containers hosting sockjs apps. This affects the package sockjs before 0.3.20.

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