[submodule] Update submodule sonic-sairedis to the latest HEAD automatically (sonic-net#24778)

#### Why I did it
src/sonic-sairedis
```
* b70dfa75 - (HEAD -> master, origin/master, origin/HEAD) Support for sonic-mgmt ACL testing on VPP (sonic-net#1599) (2 hours ago) [AkeelAli]
```
#### How I did it
#### How to verify it
#### Description for the changelog

Signed-off-by: Feng Pan <[email protected]>

Author: mssonicbld