Bump @primer/css from 15.2.0 to 21.3.1

Bumps [@primer/css](https://github.com/primer/css) from 15.2.0 to 21.3.1.
- [Release notes](https://github.com/primer/css/releases)
- [Changelog](https://github.com/primer/css/blob/main/CHANGELOG.md)
- [Commits](primer/css@v15.2.0...v21.3.1)

---
updated-dependencies:
- dependency-name: "@primer/css"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -4,7 +4,7 @@
     "url": "https://github.com/JV-conseil/jekyll-theme-read-the-docs/issues"
   },
   "dependencies": {
-    "@primer/css": "15.2.0",
+    "@primer/css": "21.3.1",
     "dompurify": "^3.1.0",
     "font-awesome": "^4.7.0",
     "jquery": "^3.7.1",

yarn.lock

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+  languageName: node
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+  languageName: node
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   resolution: "@humanwhocodes/config-array@npm:0.12.3"
@@ -1660,6 +1741,13 @@ __metadata:
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   linkType: hard
 
+"@oddbird/popover-polyfill@npm:^0.4.0":
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@@ -1674,23 +1762,46 @@ __metadata:
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+  resolution: "@primer/css@npm:21.3.1"
   dependencies:
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-  resolution: "@primer/octicons@npm:9.6.0"
+"@primer/primitives@npm:^7.15.12":
+  version: 7.17.1
+  resolution: "@primer/primitives@npm:7.17.1"
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+  languageName: node
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+  resolution: "@primer/view-components@npm:0.22.0"
   dependencies:
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+    "@github/auto-check-element": "npm:^5.2.0"
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+    "@github/tab-container-element": "npm:^3.1.2"
+    "@oddbird/popover-polyfill": "npm:^0.4.0"
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     "@babel/preset-env": "npm:^7.24.4"
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     babel-loader: "npm:^9.1.3"
     css-loader: "npm:^7.1.1"
     depcheck: "npm:^1.4.7"
@@ -5662,13 +5773,6 @@ __metadata:
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