[Snyk] Fix for 2 vulnerabilities (#196)

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### Snyk has created this PR to fix 2 vulnerabilities in the pnpm
dependencies of this project.

#### Snyk changed the following file(s):

- `packages/pluggable-widgets-tools/package.json`



<details>
<summary>⚠️ <b>Warning</b></summary>

```
Failed to update the pnpm-lock.yaml, please update manually before merging.
```

</details>



#### Vulnerabilities that will be fixed with an upgrade:

|  | Issue | Score | 

:-------------------------:|:-------------------------|:-------------------------
![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
'high severity') | Inefficient Algorithmic Complexity
<br/>[SNYK-JS-JSYAML-18313070](https://snyk.io/vuln/SNYK-JS-JSYAML-18313070)
| &nbsp;&nbsp;**828**&nbsp;&nbsp;
![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
'high severity') | Directory Traversal
<br/>[SNYK-JS-POSTCSS-18313038](https://snyk.io/vuln/SNYK-JS-POSTCSS-18313038)
| &nbsp;&nbsp;**721**&nbsp;&nbsp;


#### Breaking Change Risk

![Merge Risk:
High](https://img.shields.io/badge/Merge%20Risk%3A%20High-4B0000?style=for-the-badge)

> **Notice:** This assessment is enhanced by AI.



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[//]: #
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Author: weirdwater

packages/pluggable-widgets-tools/package.json

@@ -80,7 +80,7 @@
     "make-dir": "^5.1.0",
     "mendix": "^11.8.0",
     "mime": "^4.1.0",
-    "postcss": "^8.5.10",
+    "postcss": "^8.5.18",
     "postcss-import": "^14.0.2",
     "postcss-url": "^10.1.4",
     "prettier": "^2.5.1",