Upgrade: Bump postcss-loader from 6.2.1 to 7.0.0

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 6.2.1 to 7.0.0.
- [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/v6.2.1...v7.0.0)

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

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

package.json

@@ -14,7 +14,7 @@
     "@vuepress/plugin-back-to-top": "^2.0.0-beta.25",
     "@vuepress/plugin-debug": "^2.0.0-beta.25",
     "@vuepress/plugin-search": "^2.0.0-beta.25",
-    "postcss-loader": "^6.2.1",
+    "postcss-loader": "^7.0.0",
     "prettier": "^2.6.2",
     "sass": "^1.51.0",
     "sass-loader": "^13.0.0",

yarn.lock

@@ -3663,14 +3663,14 @@ postcss-loader@^6.1.1:
     klona "^2.0.4"
     semver "^7.3.5"
 
-postcss-loader@^6.2.1:
-  version "6.2.1"
-  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-6.2.1.tgz#0895f7346b1702103d30fdc66e4d494a93c008ef"
-  integrity sha512-WbbYpmAaKcux/P66bZ40bpWsBucjx/TTgVVzRZ9yUO8yQfVBlameJ0ZGVaPfH64hNSBh63a+ICP5nqOpBA0w+Q==
+postcss-loader@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-loader/-/postcss-loader-7.0.0.tgz#367d10eb1c5f1d93700e6b399683a6dc7c3af396"
+  integrity sha512-IDyttebFzTSY6DI24KuHUcBjbAev1i+RyICoPEWcAstZsj03r533uMXtDn506l6/wlsRYiS5XBdx7TpccCsyUg==
   dependencies:
     cosmiconfig "^7.0.0"
     klona "^2.0.5"
-    semver "^7.3.5"
+    semver "^7.3.7"
 
 postcss-modules-extract-imports@^3.0.0:
   version "3.0.0"
@@ -4035,10 +4035,10 @@ selfsigned@^1.10.11:
   dependencies:
     node-forge "^0.10.0"
 
-semver@^7.3.5:
-  version "7.3.5"
-  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.5.tgz#0b621c879348d8998e4b0e4be94b3f12e6018ef7"
-  integrity sha512-PoeGJYh8HK4BTO/a9Tf6ZG3veo/A7ZVsYrSA6J8ny9nb3B1VrpkuN+z9OE5wfE5p6H4LchYZsegiQgbJD94ZFQ==
+semver@^7.3.5, semver@^7.3.7:
+  version "7.3.7"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.7.tgz#12c5b649afdbf9049707796e22a4028814ce523f"
+  integrity sha512-QlYTucUYOews+WeEujDoEGziz4K6c47V/Bd+LjSSYcA94p+DmINdf7ncaUinThfvZyu13lN9OY1XDxt8C0Tw0g==
   dependencies:
     lru-cache "^6.0.0"