build(deps-dev): bump brace-expansion from 1.1.15 to 1.1.21 in /website

Bumps [brace-expansion](https://github.com/juliangruber/brace-expansion) from 1.1.15 to 1.1.21.
- [Release notes](https://github.com/juliangruber/brace-expansion/releases)
- [Commits](https://github.com/juliangruber/brace-expansion/compare/v1.1.15...v1.1.21)

---
updated-dependencies:
- dependency-name: brace-expansion
  dependency-version: 1.1.21
  dependency-type: indirect
...

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

website/package-lock.json

@@ -7,15 +7,15 @@
     "": {
       "name": "kst4contest-website",
       "version": "0.1.0",
-      "engines": {
-        "node": ">=18.19.1"
-      },
       "dependencies": {
         "markdown-it": "^14.3.0",
         "markdown-it-anchor": "^9.2.0"
       },
       "devDependencies": {
         "@11ty/eleventy": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=18.19.1"
       }
     },
     "node_modules/@11ty/dependency-tree": {
@@ -397,9 +397,9 @@
       }
     },
     "node_modules/brace-expansion": {
-      "version": "1.1.15",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.15.tgz",
-      "integrity": "sha512-EwOCDEex4quD37XhqM3omwtMoJjr//isUZz1JopUNWms+4Z2ViyM/k1YIRePpoVNnQhENnxtFjLaxNHrT7xIUg==",
+      "version": "1.1.21",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.21.tgz",
+      "integrity": "sha512-9zeA+KLZNNzglF2TPKRQEDyx6Yby7daAkuy8MiPzpXPsYDWi/DRM8jmwUDxokQjYqBpv5DgPiwD4h4ZZSy1Ujw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {