Bump @preact/preset-vite from 2.5.0 to 2.6.0 in /webapp

Bumps [@preact/preset-vite](https://github.com/preactjs/preset-vite) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/preactjs/preset-vite/releases)
- [Commits](preactjs/preset-vite@v2.5.0...2.6.0)

---
updated-dependencies:
- dependency-name: "@preact/preset-vite"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

webapp/package.json

@@ -13,7 +13,7 @@
 		"preact-render-to-string": "^6.2.2"
 	},
 	"devDependencies": {
-		"@preact/preset-vite": "^2.5.0",
+		"@preact/preset-vite": "^2.6.0",
 		"typescript": "^5.2.2",
 		"vite": "^4.4.11"
 	}