Bump the npm_and_yarn group across 4 directories with 3 updates

Bumps the npm_and_yarn group with 2 updates in the / directory: [next](https://github.com/vercel/next.js) and [nanoid](https://github.com/ai/nanoid).
Bumps the npm_and_yarn group with 1 update in the /apps/www directory: [next](https://github.com/vercel/next.js).
Bumps the npm_and_yarn group with 2 updates in the /templates/plate-playground-template directory: [next](https://github.com/vercel/next.js) and [nanoid](https://github.com/ai/nanoid).
Bumps the npm_and_yarn group with 2 updates in the /templates/plate-template directory: [next](https://github.com/vercel/next.js) and [nanoid](https://github.com/ai/nanoid).


Updates `next` from 15.0.3 to 15.1.2
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.0.3...v15.1.2)

Updates `nanoid` from 3.3.8 to 5.0.9
- [Release notes](https://github.com/ai/nanoid/releases)
- [Changelog](https://github.com/ai/nanoid/blob/main/CHANGELOG.md)
- [Commits](ai/nanoid@3.3.8...5.0.9)

Updates `next` from 15.0.3 to 15.1.2
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.0.3...v15.1.2)

Updates `next` from 15.1.4 to 15.1.5
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.0.3...v15.1.2)

Updates `nanoid` from 3.3.7 to 3.3.8
- [Release notes](https://github.com/ai/nanoid/releases)
- [Changelog](https://github.com/ai/nanoid/blob/main/CHANGELOG.md)
- [Commits](ai/nanoid@3.3.8...5.0.9)

Updates `cross-spawn` from 7.0.3 to 7.0.6
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@v7.0.3...v7.0.6)

Updates `next` from 15.1.4 to 15.1.5
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.0.3...v15.1.2)

Updates `nanoid` from 3.3.7 to 3.3.8
- [Release notes](https://github.com/ai/nanoid/releases)
- [Changelog](https://github.com/ai/nanoid/blob/main/CHANGELOG.md)
- [Commits](ai/nanoid@3.3.8...5.0.9)

Updates `cross-spawn` from 7.0.3 to 7.0.6
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@v7.0.3...v7.0.6)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: nanoid
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: next
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: next
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: nanoid
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: cross-spawn
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: next
  dependency-type: direct:production
  dependency-group: npm_and_yarn
- dependency-name: nanoid
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: cross-spawn
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>

templates/plate-playground-template/package.json

@@ -83,7 +83,7 @@
     "date-fns": "^4.1.0",
     "html2canvas": "^1.4.1",
     "lucide-react": "0.469.0",
-    "next": "^15.1.4",
+    "next": "^15.1.6",
     "pdf-lib": "^1.17.1",
     "prismjs": "^1.29.0",
     "react": "^18.3.1",