fix: examples/with-unsplash/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BROWSERSLIST-1090194
- https://snyk.io/vuln/SNYK-JS-GLOBPARENT-1016905
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3042992
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3043105
- https://snyk.io/vuln/SNYK-JS-LOADERUTILS-3105943
- https://snyk.io/vuln/SNYK-JS-NEXT-1540422
- https://snyk.io/vuln/SNYK-JS-NODEFETCH-2342118
- https://snyk.io/vuln/SNYK-JS-NODEFETCH-674311
- https://snyk.io/vuln/SNYK-JS-OBJECTPATH-1017036
- https://snyk.io/vuln/SNYK-JS-OBJECTPATH-1569453
- https://snyk.io/vuln/SNYK-JS-OBJECTPATH-1585658
- https://snyk.io/vuln/SNYK-JS-POSTCSS-1090595
- https://snyk.io/vuln/SNYK-JS-POSTCSS-1255640
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692
- https://snyk.io/vuln/SNYK-JS-SHELLQUOTE-1766506
- https://snyk.io/vuln/SNYK-JS-URLPARSE-1078283
- https://snyk.io/vuln/SNYK-JS-URLPARSE-1533425
- https://snyk.io/vuln/SNYK-JS-URLPARSE-2401205
- https://snyk.io/vuln/SNYK-JS-URLPARSE-2407759
- https://snyk.io/vuln/SNYK-JS-URLPARSE-2407770
- https://snyk.io/vuln/SNYK-JS-URLPARSE-2412697

examples/with-unsplash/package.json

@@ -6,11 +6,11 @@
     "start": "next start"
   },
   "dependencies": {
-    "next": "^9.5.1",
+    "next": "^13.5.4",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "swr": "^2.0.0",
-    "unsplash-js": "^6.0.0"
+    "unsplash-js": "^7.0.0"
   },
   "devDependencies": {
     "@types/node": "^14.0.27",