Bump @babel/plugin-proposal-optional-chaining from 7.16.7 to 7.21.0

Bumps [@babel/plugin-proposal-optional-chaining](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-proposal-optional-chaining) from 7.16.7 to 7.21.0.
- [Release notes](https://github.com/babel/babel/releases)
- [Commits](https://github.com/babel/babel/commits/v7.21.0/packages/babel-plugin-proposal-optional-chaining)

---
updated-dependencies:
- dependency-name: "@babel/plugin-proposal-optional-chaining"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]