chore(deps): bump the npm_and_yarn group across 1 directory with 3 updates

Bumps the npm_and_yarn group with 3 updates in the / directory: [next](https://github.com/vercel/next.js), [@babel/plugin-transform-modules-systemjs](https://github.com/babel/babel/tree/HEAD/packages/babel-plugin-transform-modules-systemjs) and [fast-uri](https://github.com/fastify/fast-uri).


Updates `next` from 15.5.18 to 16.2.6
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v15.5.18...v16.2.6)

Updates `@babel/plugin-transform-modules-systemjs` from 7.27.1 to 7.29.4
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/commits/v7.29.4/packages/babel-plugin-transform-modules-systemjs)

Updates `fast-uri` from 3.0.6 to 3.1.2
- [Release notes](https://github.com/fastify/fast-uri/releases)
- [Commits](fastify/fast-uri@v3.0.6...v3.1.2)

---
updated-dependencies:
- dependency-name: "@babel/plugin-transform-modules-systemjs"
  dependency-version: 7.29.4
  dependency-type: indirect
- dependency-name: fast-uri
  dependency-version: 3.1.2
  dependency-type: indirect
- dependency-name: next
  dependency-version: 15.5.18
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/alchemy-privy-integration-example/package.json

@@ -12,7 +12,7 @@
     "@account-kit/privy-integration": "*",
     "@privy-io/react-auth": "^3.3.0",
     "@solana-program/memo": "^0.9.0",
-    "next": "^15.5.18",
+    "next": "^16.2.6",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "viem": "^2.45.0"

examples/ui-demo/package.json

@@ -42,7 +42,7 @@
     "clsx": "^2.1.1",
     "dedent": "^1.5.3",
     "lucide-react": "^0.394.0",
-    "next": "^15.5.18",
+    "next": "^16.2.6",
     "prettier": "3.3.3",
     "qrcode.react": "^4.2.0",
     "react": "^18",