Upgrade: Bump postcss-loader from 6.1.0 to 6.1.1

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 6.1.0 to 6.1.1.
- [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/v6.1.0...v6.1.1)

---
updated-dependencies:
- dependency-name: postcss-loader
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -12,7 +12,7 @@
     "@vuepress/plugin-back-to-top": "^2.0.0-beta.20",
     "@vuepress/plugin-debug": "^2.0.0-beta.20",
     "@vuepress/plugin-search": "^2.0.0-beta.20",
-    "postcss-loader": "^6.1.0",
+    "postcss-loader": "^6.1.1",
     "prettier": "2.3.2",
     "sass": "1.35.1",
     "sass-loader": "^12.1.0",

yarn.lock

@@ -3307,10 +3307,10 @@ postcss-csso@^5.0.1:
   dependencies:
     csso "^4.0.2"
 
-postcss-loader@^6.1.0:
-  version "6.1.0"
-  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-6.1.0.tgz#13c800a00b3c7d434a1319a73d85e2df0714cdde"
-  integrity sha512-yA/cXBfACkthZNA2hQxOnaReVfQ6uLmvbEDQzNafpbK40URZJvP/28dL1DG174Gvz3ptkkHbbwDBCh+gXR94CA==
+postcss-loader@^6.1.0, postcss-loader@^6.1.1:
+  version "6.1.1"
+  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-6.1.1.tgz#58dd0a3accd9bc87cc52eff75244db578d11301a"
+  integrity sha512-lBmJMvRh1D40dqpWKr9Rpygwxn8M74U9uaCSeYGNKLGInbk9mXBt1ultHf2dH9Ghk6Ue4UXlXWwGMH9QdUJ5ug==
   dependencies:
     cosmiconfig "^7.0.0"
     klona "^2.0.4"