[submodule] Update submodule sonic-swss to the latest HEAD automatica…

…lly (sonic-net#503)

#### Why I did it
src/sonic-swss
```
* 2c12aab - (HEAD -> 202405, origin/202405) [Chassis][202405] Changes to read route tag value from Netlink Message and take appropriate action (4 hours ago) [Arvindsrinivasan Lakshmi Narasimhan]
|\ 
| failure_prs.log skip_prs.log a609f3e - Changes to read route tag value from Netlink Message and take appropriate action (5 hours ago) [Abhishek Dosi]
* 857dd6a - [202405][Chassis] Added Change for given Route ECMP to fallback on Default Route ECMP (5 hours ago) [Arvindsrinivasan Lakshmi Narasimhan]
* d1bd128 - Added Change for given Route ECMP to fallback on Default Route ECMP (5 hours ago) [Abhishek Dosi]
```
#### How I did it
#### How to verify it
#### Description for the changelog