chore(deps): bump @azure/identity and tedious in /migrations

Bumps [@azure/identity](https://github.com/Azure/azure-sdk-for-js) to 4.2.1 and updates ancestor dependency [tedious](https://github.com/tediousjs/tedious). These dependencies need to be updated together.


Updates `@azure/identity` from 3.4.2 to 4.2.1
- [Release notes](https://github.com/Azure/azure-sdk-for-js/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-js/blob/main/documentation/Changelog-for-next-generation.md)
- [Commits](https://github.com/Azure/azure-sdk-for-js/compare/@azure/identity_3.4.2...@azure/identity_4.2.1)

Updates `tedious` from 17.0.0 to 18.2.1
- [Release notes](https://github.com/tediousjs/tedious/releases)
- [Commits](tediousjs/tedious@v17.0.0...v18.2.1)

---
updated-dependencies:
- dependency-name: "@azure/identity"
  dependency-type: indirect
- dependency-name: tedious
  dependency-type: direct:production
...

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