Auto merge of #4258 - rust-lang:renovate/postcss-8.x, r=Turbo87

Update dependency postcss to v8.4.5

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [postcss](https://postcss.org/) ([source](https://togithub.com/postcss/postcss)) | [`8.4.4` -> `8.4.5`](https://renovatebot.com/diffs/npm/postcss/8.4.4/8.4.5) | [![age](https://badges.renovateapi.com/packages/npm/postcss/8.4.5/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/postcss/8.4.5/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/postcss/8.4.5/compatibility-slim/8.4.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/postcss/8.4.5/confidence-slim/8.4.4)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>postcss/postcss</summary>

### [`v8.4.5`](https://togithub.com/postcss/postcss/blob/master/CHANGELOG.md#&#8203;845)

[Compare Source](https://togithub.com/postcss/postcss/compare/8.4.4...8.4.5)

-   Fixed `raws` types to make object extendable (by James Garbutt).
-   Moved from Yarn 1 to pnpm.

</details>

---

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Author: bors

package.json

@@ -131,7 +131,7 @@
   },
   "resolutions": {
     "@ember/string": "3.0.0",
-    "ember-css-modules/postcss": "8.4.4",
+    "ember-css-modules/postcss": "8.4.5",
     "ember-inflector": "4.0.2",
     "ember-modifier": "3.0.0"
   },

yarn.lock

@@ -12094,10 +12094,10 @@ postcss-values-parser@^2.0.0, postcss-values-parser@^2.0.1:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss@8.4.4, postcss@^8.0.0, postcss@^8.1.4, postcss@^8.2.15:
-  version "8.4.4"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.4.tgz#d53d4ec6a75fd62557a66bb41978bf47ff0c2869"
-  integrity sha512-joU6fBsN6EIer28Lj6GDFoC/5yOZzLCfn0zHAn/MYXI7aPt4m4hK5KC5ovEZXy+lnCjmYIbQWngvju2ddyEr8Q==
+postcss@8.4.5, postcss@^8.0.0, postcss@^8.1.4, postcss@^8.2.15:
+  version "8.4.5"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.5.tgz#bae665764dfd4c6fcc24dc0fdf7e7aa00cc77f95"
+  integrity sha512-jBDboWM8qpaqwkMwItqTQTiFikhs/67OYVvblFFTM7MrZjt6yMKd6r2kgXizEbTTljacm4NldIlZnhbjr84QYg==
   dependencies:
     nanoid "^3.1.30"
     picocolors "^1.0.0"