NPM: Bump the npm-dependencies group with 4 updates

---
updated-dependencies:
- dependency-name: mermaid
  dependency-version: 11.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
- dependency-name: postcss
  dependency-version: 8.5.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm-dependencies
- dependency-name: prettier
  dependency-version: 3.6.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
- dependency-name: stylelint
  dependency-version: 16.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
...

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

Author: dependabot[bot]

package-lock.json

@@ -11,17 +11,17 @@
         "@hotwired/stimulus": "^3.2.1",
         "@hotwired/turbo": "^7.3.0",
         "highlight.js": "^11.11.1",
-        "mermaid": "^11.6.0",
+        "mermaid": "^11.7.0",
         "normalize.css": "^8.0.1",
         "vega": "^6.1.2",
         "vega-tooltip": "^1.0.0"
     },
     "devDependencies": {
         "esbuild": "^0.25.5",
         "esbuild-sass-plugin": "^3.3.1",
-        "postcss": "^8.5.5",
-        "prettier": "^3.5.3",
-        "stylelint": "^16.20.0",
+        "postcss": "^8.5.6",
+        "prettier": "^3.6.0",
+        "stylelint": "^16.21.0",
         "stylelint-config-standard-scss": "^15.0.1",
         "stylelint-order": "^7.0.0",
         "stylelint-scss": "^6.12.1"