Bump torch from 1.9.0 to 2.7.1 in /distributed/rpc/pipeline

Bumps [torch](https://github.com/pytorch/pytorch) from 1.9.0 to 2.7.1.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](pytorch/pytorch@v1.9.0...v2.7.1)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.7.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

distributed/rpc/pipeline/requirements.txt

@@ -1,2 +1,2 @@
-torch==1.9.0
+torch==2.8.0
 torchvision==0.7.0