Update dependency tomli_w to v1.2.0 (#15600)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [tomli_w](https://redirect.github.com/hukkin/tomli-w)
([changelog](https://redirect.github.com/hukkin/tomli-w/blob/master/CHANGELOG.md))
| `==1.1.0` -> `==1.2.0` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/tomli-w/1.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/pypi/tomli-w/1.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/pypi/tomli-w/1.1.0/1.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/tomli-w/1.1.0/1.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

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---

### Release Notes

<details>
<summary>hukkin/tomli-w (tomli_w)</summary>

###
[`v1.2.0`](https://redirect.github.com/hukkin/tomli-w/blob/HEAD/CHANGELOG.md#120)

[Compare
Source](https://redirect.github.com/hukkin/tomli-w/compare/1.1.0...1.2.0)

-   Added
    -   Always preserve `decimal.Decimal` type in parse round trips
-   Improved
    -   Better `TypeError` message on invalid mapping keys
    -   Unify type representation in error messages
-   Performance
    -   Improve import time by removing `typing` import
    -   Improve import time by removing `string` import
    -   Improve import time by lazy importing `decimal`

</details>

---

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python/ruff-ecosystem/pyproject.toml

@@ -6,7 +6,7 @@ build-backend = "hatchling.build"
 name = "ruff-ecosystem"
 version = "0.0.0"
 requires-python = ">=3.11"
-dependencies = ["unidiff==0.7.5", "tomli_w==1.1.0", "tomli==2.2.1"]
+dependencies = ["unidiff==0.7.5", "tomli_w==1.2.0", "tomli==2.2.1"]
 
 [project.scripts]
 ruff-ecosystem = "ruff_ecosystem.cli:entrypoint"