[FEATURE] Bump lit version in lit template

[matthme]

Bump the lit template to lit version 3.x. It is currently using lit 2.6.

This would mean replacing:

    "@lit-labs/context": "^0.2.0",
    "@lit-labs/task": "^2.0.0",
    "lit": "^2.6.1"

with

    "lit": "^3.1.0",
    "@lit/context": "^1.1.0",
    "@lit/task": "^1.0.0",

Although I think "@lit/task": "^1.0.0" is not even used anywhere so it can potentially get removed completely.

It may also require smaller code changes but nothing major I think.

[c12i]

Cool, I have updated to the latest versions and moved context and task from -labs with #407

I don't think we can removed @lit/task just yet, Task is still in use here for example

[matthme]

Oh cool, great :)

I don't think we can removed @lit/task just yet, Task is still in use here for example

Okay, I did not see this, let's just keep it then.