snmp-subagent changes for bookworm upgrade

[mohan-selvaraj]

- What I did
remove loop argument from asyncio APIs

- How I did it

- How to verify it

- Description for the changelog

[mohan-selvaraj]

To be combined with "bookworm container upgrade for lldp, net-snmp" PR
sonic-net/sonic-buildimage#18150

[saiarcot895]

@qiluo-msft, could you help to review this, or assign someone to review? Some additional context: https://stackoverflow.com/a/60315290

[adyeung]

@qiluo-msft @SuvarnaMeenakshi pls review this is blocking lldp bookworm migration

[saiarcot895]

Could you include 2dbbb5c in your branch? This is to add some code coverage for these changes. This will bump up the code coverage to 83%

[mohan-selvaraj]

Could you include 2dbbb5c in your branch? This is to add some code coverage for these changes. This will bump up the code coverage to 83%

Couldn't directly pull the commit. Added the changes to the branch and mentioned the commit ID in the commit message.
Thank you.