chore(deps): Bump @azure/identity and @evidence-dev/evidence in /sample

Removes [@azure/identity](https://github.com/Azure/azure-sdk-for-js). It's no longer used after updating ancestor dependency @evidence-dev/evidence. These dependencies need to be updated together.


Removes `@azure/identity`

Updates `@evidence-dev/evidence` from 21.0.3 to 39.1.2

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

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