chore(deps-dev): bump postcss-loader in /src/packages/excalidraw (#3585)

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 5.2.0 to 5.3.0.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/postcss-loader/compare/v5.2.0...v5.3.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/packages/excalidraw/package.json

@@ -63,7 +63,7 @@
     "css-loader": "5.2.4",
     "file-loader": "6.2.0",
     "mini-css-extract-plugin": "1.6.0",
-    "postcss-loader": "5.2.0",
+    "postcss-loader": "5.3.0",
     "sass-loader": "11.0.1",
     "terser-webpack-plugin": "5.1.1",
     "ts-loader": "8.1.0",

src/packages/excalidraw/yarn.lock

@@ -2327,10 +2327,10 @@ pkg-dir@^4.1.0, pkg-dir@^4.2.0:
   dependencies:
     find-up "^4.0.0"
 
-postcss-loader@5.2.0:
-  version "5.2.0"
-  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-5.2.0.tgz#ccd6668a778902d653602289c765a8bc481986dc"
-  integrity sha512-uSuCkENFeUaOYsKrXm0eNNgVIxc71z8RcckLMbVw473rGojFnrUeqEz6zBgXsH2q1EIzXnO/4pEz9RhALjlITA==
+postcss-loader@5.3.0:
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-5.3.0.tgz#1657f869e48d4fdb018a40771c235e499ee26244"
+  integrity sha512-/+Z1RAmssdiSLgIZwnJHwBMnlABPgF7giYzTN2NOfr9D21IJZ4mQC1R2miwp80zno9M4zMD/umGI8cR+2EL5zw==
   dependencies:
     cosmiconfig "^7.0.0"
     klona "^2.0.4"