fix(deps): update minor and patch for gatsby-plugin-postcss (#28831)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

packages/gatsby-plugin-postcss/package.json

@@ -8,7 +8,7 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.12.5",
-    "postcss-loader": "^4.0.4"
+    "postcss-loader": "^4.1.0"
   },
   "devDependencies": {
     "@babel/cli": "^7.12.1",

yarn.lock

@@ -19322,10 +19322,10 @@ postcss-loader@^3.0.0:
     postcss-load-config "^2.0.0"
     schema-utils "^1.0.0"
 
-postcss-loader@^4.0.4:
-  version "4.0.4"
-  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-4.0.4.tgz#b2d005b52e008a44991cf8123bee207e635eb53e"
-  integrity sha512-pntA9zIR14drQo84yGTjQJg1m7T0DkXR4vXYHBngiRZdJtEeCrojL6lOpqUanMzG375lIJbT4Yug85zC/AJWGw==
+postcss-loader@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-4.1.0.tgz#4647a6c8dad3cb6b253fbfaa21d62201086f6e39"
+  integrity sha512-vbCkP70F3Q9PIk6d47aBwjqAMI4LfkXCoyxj+7NPNuVIwfTGdzv2KVQes59/RuxMniIgsYQCFSY42P3+ykJfaw==
   dependencies:
     cosmiconfig "^7.0.0"
     klona "^2.0.4"