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

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692

example/package.json

@@ -55,7 +55,7 @@
     "@types/express": "^4.17.14",
     "autoprefixer": "^10.4.13",
     "nodemon": "^2.0.20",
-    "postcss": "^8.4.19",
+    "postcss": "^8.4.31",
     "tailwindcss": "^3.2.4"
   }
 }

example/yarn.lock

@@ -1530,7 +1530,7 @@
   integrity sha512-Hcv+nVC0kZnQ3tD9GVu5xSMR4VVYOteQIr/hwFPVEvPdlXqgGEuRjiheChHgdM+JyqdgNcmzZOX/tnl0JOiI7A==
 
 "@mohalla-tech/xss-safeguard@../":
-  version "0.1.0"
+  version "0.0.0"
 
 "@nicolo-ribaudo/[email protected]":
   version "5.1.1-v1"
@@ -6314,6 +6314,11 @@ nanoid@^3.3.4:
   resolved "https://registry.npmjs.org/nanoid/-/nanoid-3.3.4.tgz#730b67e3cd09e2deacf03c027c81c9d9dbc5e8ab"
   integrity sha512-MqBkQh/OHTS2egovRtLk45wEyNXwF+cokD+1YPf9u5VfJiRdAiRwB2froX5Co9Rh20xs4siNPm8naNotSD6RBw==
 
+nanoid@^3.3.6:
+  version "3.3.6"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.6.tgz#443380c856d6e9f9824267d960b4236ad583ea4c"
+  integrity sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==
+
 natural-compare-lite@^1.4.0:
   version "1.4.0"
   resolved "https://registry.npmjs.org/natural-compare-lite/-/natural-compare-lite-1.4.0.tgz#17b09581988979fddafe0201e931ba933c96cbb4"
@@ -7288,7 +7293,7 @@ postcss@^7.0.35:
     picocolors "^0.2.1"
     source-map "^0.6.1"
 
-postcss@^8.3.5, postcss@^8.4.18, postcss@^8.4.19, postcss@^8.4.4:
+postcss@^8.3.5, postcss@^8.4.18, postcss@^8.4.4:
   version "8.4.19"
   resolved "https://registry.npmjs.org/postcss/-/postcss-8.4.19.tgz#61178e2add236b17351897c8bcc0b4c8ecab56fc"
   integrity sha512-h+pbPsyhlYj6N2ozBmHhHrs9DzGmbaarbLvWipMRO7RLS+v4onj26MPFXA5OBYFxyqYhUJK456SwDcY9H2/zsA==
@@ -7297,6 +7302,15 @@ postcss@^8.3.5, postcss@^8.4.18, postcss@^8.4.19, postcss@^8.4.4:
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
+postcss@^8.4.31:
+  version "8.4.31"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.31.tgz#92b451050a9f914da6755af352bdc0192508656d"
+  integrity sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==
+  dependencies:
+    nanoid "^3.3.6"
+    picocolors "^1.0.0"
+    source-map-js "^1.0.2"
+
 prelude-ls@^1.2.1:
   version "1.2.1"
   resolved "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"