build(deps-dev): bump @babel/plugin-transform-nullish-coalescing-operator

Bumps [@babel/plugin-transform-nullish-coalescing-operator](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-transform-nullish-coalescing-operator) from 7.25.9 to 7.26.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.26.6/packages/babel-plugin-transform-nullish-coalescing-operator)

---
updated-dependencies:
- dependency-name: "@babel/plugin-transform-nullish-coalescing-operator"
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]