Bump postcss from 8.4.12 to 8.4.31 in /webpack-plugin

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.12 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.12...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

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

webpack-plugin/package-lock.json

@@ -1059,10 +1059,16 @@
 			"dev": true
 		},
 		"node_modules/nanoid": {
-			"version": "3.3.2",
-			"resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.2.tgz",
-			"integrity": "sha512-CuHBogktKwpm5g2sRgv83jEy2ijFzBwMoYA60orPDR7ynsLijJDqgsi4RDGj3OJpy3Ieb+LYwiRmIOGyytgITA==",
+			"version": "3.3.6",
+			"resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
+			"integrity": "sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==",
 			"dev": true,
+			"funding": [
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/ai"
+				}
+			],
 			"bin": {
 				"nanoid": "bin/nanoid.cjs"
 			},
@@ -1206,9 +1212,9 @@
 			}
 		},
 		"node_modules/postcss": {
-			"version": "8.4.12",
-			"resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.12.tgz",
-			"integrity": "sha512-lg6eITwYe9v6Hr5CncVbK70SoioNQIq81nsaG86ev5hAidQvmOeETBqs7jm43K2F5/Ley3ytDtriImV6TpNiSg==",
+			"version": "8.4.31",
+			"resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+			"integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
 			"dev": true,
 			"funding": [
 				{
@@ -1218,10 +1224,14 @@
 				{
 					"type": "tidelift",
 					"url": "https://tidelift.com/funding/github/npm/postcss"
+				},
+				{
+					"type": "github",
+					"url": "https://github.com/sponsors/ai"
 				}
 			],
 			"dependencies": {
-				"nanoid": "^3.3.1",
+				"nanoid": "^3.3.6",
 				"picocolors": "^1.0.0",
 				"source-map-js": "^1.0.2"
 			},
@@ -2618,9 +2628,9 @@
 			"dev": true
 		},
 		"nanoid": {
-			"version": "3.3.2",
-			"resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.2.tgz",
-			"integrity": "sha512-CuHBogktKwpm5g2sRgv83jEy2ijFzBwMoYA60orPDR7ynsLijJDqgsi4RDGj3OJpy3Ieb+LYwiRmIOGyytgITA==",
+			"version": "3.3.6",
+			"resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.6.tgz",
+			"integrity": "sha512-BGcqMMJuToF7i1rt+2PWSNVnWIkGCU78jBG3RxO/bZlnZPK2Cmi2QaffxGO/2RvWi9sL+FAiRiXMgsyxQ1DIDA==",
 			"dev": true
 		},
 		"neo-async": {
@@ -2726,12 +2736,12 @@
 			}
 		},
 		"postcss": {
-			"version": "8.4.12",
-			"resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.12.tgz",
-			"integrity": "sha512-lg6eITwYe9v6Hr5CncVbK70SoioNQIq81nsaG86ev5hAidQvmOeETBqs7jm43K2F5/Ley3ytDtriImV6TpNiSg==",
+			"version": "8.4.31",
+			"resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+			"integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
 			"dev": true,
 			"requires": {
-				"nanoid": "^3.3.1",
+				"nanoid": "^3.3.6",
 				"picocolors": "^1.0.0",
 				"source-map-js": "^1.0.2"
 			}