[submodule] Update submodule sonic-snmpagent to the latest HEAD automatically (#17853)

#### Why I did it
src/sonic-snmpagent
```
* b0a4bcc - (HEAD -> 202305, origin/202305) Set the execute bit on sysDescr_pass.py (#306) (22 hours ago) [Andre Kostur]
```
#### How I did it
#### How to verify it
#### Description for the changelog
This commit is contained in:
mssonicbld 2024-01-19 18:36:00 +08:00 committed by GitHub
parent 30b1f05f0c
commit fc7a1ac02f
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@ -1 +1 @@
Subproject commit e5fd19294dce62ce256e3a27d786a49c00e18824
Subproject commit b0a4bcc750abed449f08cfe0b8759e4f58f22816