templates the changes in https://github.com/ArcadeAI/monorepo/pull/765
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Low risk: adds `uv` configuration to generated templates and bumps the
package version, with no runtime logic changes.
>
> **Overview**
> Updates the `arcade new` **full** template `pyproject.toml` to include
a new `[tool.uv]` section that pins resolver behavior via `exclude-newer
= "1 week"` while exempting key `arcade-*` packages.
>
> Bumps the root project version from `1.12.2` to `1.12.3`.
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
fd47343d52ee51700affad5c3f1701b3e143002f. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
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