fix(deps): release new embedded sdk

[rusackas]

SUMMARY

According to the docs, merging this will run node ./release-if-necessary.js on merge to master on CI, which will push the new version to npm.

The new version includes @superset-ui/switchboard v20.2, which solves a bunch of issues I won't discuss here.

I think this module should move into /packages/ and be released via lerna like everything else, but that's another story.

I went with a more conventional version number since it's been "alpha" for too long, and is in prod worldwide, including on Preset and other large installations.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API