fix: docs/package.json & docs/yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908
- https://snyk.io/vuln/SNYK-JS-CSSWHAT-1298035
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2330875
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2331908
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2430337
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2430339
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2430341
- https://snyk.io/vuln/SNYK-JS-NTHCHECK-1586032

docs/package.json

@@ -139,7 +139,7 @@
     "css-declaration-sorter": "^5.1.2",
     "css-loader": "^4.2.0",
     "css-parse": "^2.0.0",
-    "css-select": "^3.1.1",
+    "css-select": "^4.0.0",
     "css-select-base-adapter": "^0.1.1",
     "css-tree": "^1.0.0-alpha.39",
     "css-unit-converter": "^1.1.2",
@@ -463,7 +463,7 @@
     "once": "^1.4.0",
     "opencollective-postinstall": "^2.0.3",
     "opn": "^6.0.0",
-    "optimize-css-assets-webpack-plugin": "^5.0.5",
+    "optimize-css-assets-webpack-plugin": "^6.0.0",
     "original": "^1.0.2",
     "os-browserify": "^0.3.0",
     "os-locale": "^5.0.0",
@@ -578,7 +578,7 @@
     "regjsparser": "^0.6.4",
     "relateurl": "^0.2.7",
     "remove-trailing-separator": "^1.1.0",
-    "renderkid": "^2.0.6",
+    "renderkid": "^3.0.0",
     "repeat-element": "^1.1.3",
     "repeat-string": "^1.6.1",
     "request": "^2.88.2",
@@ -605,7 +605,7 @@
     "section-matter": "^1.0.0",
     "select": "^1.1.2",
     "select-hose": "^2.0.0",
-    "selfsigned": "^1.10.13",
+    "selfsigned": "^2.0.0",
     "semver": "^7.3.2",
     "send": "^0.17.1",
     "serialize-javascript": "^4.0.0",