Remove workaround for esrp code signing task

[ameyapat]

Proposed changes

Earlier ESRP codesigning task used to fail because the dotnet version in ADO pipelines was updated and we had to manually switch the dotnet version as a workaround.

ESRP team has released a new version of the task that uses updated dotnet version : https://msazure.visualstudio.com/ESRPSignOnboarding/_workitems/edit/13709241

This PR aims to update the task version and remove the workaround

Type of change

• Feature work
• Bug fix
• Documentation
• Engineering change
• Test
• Logging/Telemetry

Risk

• High – Errors could cause MAJOR regression of many scenarios. (Example: new large features or high level infrastructure changes)
• Medium – Errors could cause regression of 1 or more scenarios. (Example: somewhat complex bug fixes, small new features)
• Small – No issues are expected. (Example: Very small bug fixes, string changes, or configuration settings changes)

Additional information

[azure-pipelines]

This pull request does not update CHANGELOG.md.

Please consider if this change would be noticeable to a partner or user and either update CHANGELOG.md or resolve this conversation.