📦 npm: Bump the nextjs group with 5 updates

Bumps the nextjs group with 5 updates:

| Package | From | To |
| --- | --- | --- |
| [@next/bundle-analyzer](https://github.com/vercel/next.js/tree/HEAD/packages/next-bundle-analyzer) | `15.3.0-canary.20` | `15.3.0-canary.21` |
| [@next/mdx](https://github.com/vercel/next.js/tree/HEAD/packages/next-mdx) | `15.3.0-canary.20` | `15.3.0-canary.21` |
| [@next/third-parties](https://github.com/vercel/next.js/tree/HEAD/packages/third-parties) | `15.3.0-canary.20` | `15.3.0-canary.21` |
| [next](https://github.com/vercel/next.js) | `15.3.0-canary.20` | `15.3.0-canary.21` |
| [eslint-config-next](https://github.com/vercel/next.js/tree/HEAD/packages/eslint-config-next) | `15.3.0-canary.20` | `15.3.0-canary.21` |


Updates `@next/bundle-analyzer` from 15.3.0-canary.20 to 15.3.0-canary.21
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.3.0-canary.21/packages/next-bundle-analyzer)

Updates `@next/mdx` from 15.3.0-canary.20 to 15.3.0-canary.21
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.3.0-canary.21/packages/next-mdx)

Updates `@next/third-parties` from 15.3.0-canary.20 to 15.3.0-canary.21
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.3.0-canary.21/packages/third-parties)

Updates `next` from 15.3.0-canary.20 to 15.3.0-canary.21
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/compare/v15.3.0-canary.20...v15.3.0-canary.21)

Updates `eslint-config-next` from 15.3.0-canary.20 to 15.3.0-canary.21
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v15.3.0-canary.21/packages/eslint-config-next)

---
updated-dependencies:
- dependency-name: "@next/bundle-analyzer"
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: nextjs
- dependency-name: "@next/mdx"
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: nextjs
- dependency-name: "@next/third-parties"
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: nextjs
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: nextjs
- dependency-name: eslint-config-next
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: nextjs
...

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

package.json

@@ -24,9 +24,9 @@
     "@giscus/react": "^3.1.0",
     "@mdx-js/loader": "^3.1.0",
     "@mdx-js/react": "^3.1.0",
-    "@next/bundle-analyzer": "15.3.0-canary.20",
-    "@next/mdx": "15.3.0-canary.20",
-    "@next/third-parties": "15.3.0-canary.20",
+    "@next/bundle-analyzer": "15.3.0-canary.21",
+    "@next/mdx": "15.3.0-canary.21",
+    "@next/third-parties": "15.3.0-canary.21",
     "@octokit/graphql": "^8.2.1",
     "@octokit/graphql-schema": "^15.26.0",
     "@prisma/client": "^6.5.0",
@@ -40,7 +40,7 @@
     "html-entities": "^2.5.3",
     "lucide-react": "0.483.0",
     "modern-normalize": "^3.0.1",
-    "next": "15.3.0-canary.20",
+    "next": "15.3.0-canary.21",
     "obj-str": "^1.1.0",
     "polished": "^4.3.1",
     "prop-types": "^15.8.1",
@@ -83,7 +83,7 @@
     "babel-plugin-react-compiler": "19.0.0-beta-aeaed83-20250323",
     "cross-env": "^7.0.3",
     "eslint": "^9.23.0",
-    "eslint-config-next": "15.3.0-canary.20",
+    "eslint-config-next": "15.3.0-canary.21",
     "eslint-config-prettier": "^10.1.1",
     "eslint-plugin-css-modules": "^2.12.0",
     "eslint-plugin-import": "^2.31.0",