Update .NET target framework (TFM) version #8
Description
The Task Template currently targets .NET 6.0, which will reach the end of life (EOL) in 5 days (12 Nov 2024).
Since the template is the recommended way to create Tasks, using an outdated dotnet version in the template incentivizes Tasks created from the template to also use it, which is undesirable. So, this issue aims to upgrade the Task Template project's target framework (TFM). The obvious alternative for the update is .NET 8.0, which is the current LTS. It was launched a year ago (11/2023) and will reach EOL in 2 years (11/2026).
For reference, the community task template currently targets .NETStandard 2.0 (netstandard2.0), which was replaced by .NET 5.0 and is currently not recommended by Microsoft.