fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ALTCHA-14236435

Author: snyk-bot

package-lock.json

@@ -23,7 +23,7 @@
     "@tinymce/tinymce-vue": "^6.1.0",
     "@vue-a11y/announcer": "^3.1.5",
     "@vueuse/core": "10.11",
-    "altcha": "^1.4.2",
+    "altcha": "^2.3.0",
     "chart.js": "^4.4.8",
     "clone-deep": "^4.0.1",
     "copyfiles": "^2.4.1",