🔖 release version 0.8.12 (#78)

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<details open="true"><summary>Generated summary (powered by <a href="https://app.graphite.dev">Graphite</a>)</summary>

> ## TL;DR
> This pull request updates the version of the Python Rebalancer (pyrb) package from 0.8.11 to 0.8.12 in the `pyproject.toml` file.
> 
> ## What changed
> The only change in this pull request is the version number of the pyrb package. The version has been incremented from 0.8.11 to 0.8.12.
> 
> ```diff
> -version = "0.8.11"
> +version = "0.8.12"
> ```
> 
> ## How to test
> To test this change, you can follow these steps:
> 
> 1. Pull the changes from this branch into your local environment.
> 2. Run `poetry install` to install the updated package.
> 3. Verify the installed package version by running `poetry show pyrb`.
> 
> ## Why make this change
> This change is necessary to release the new version of the pyrb package. The new version includes all the changes and improvements made since the last release (0.8.11). By incrementing the version number, we can distribute these updates to the users.
</details>

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pyrb"
-version = "0.8.11"
+version = "0.8.12"
 description = "Python Rebalancer"
 authors = ["Minki Kim <[email protected]>"]
 readme = "README.md"