chore(deps): update dependency postcss-loader to v7

Author: renovate[bot]

frontend/package.json

@@ -34,7 +34,7 @@
     "mustache": "4.2.0",
     "node-sass": "7.0.1",
     "postcss": "8.4.12",
-    "postcss-loader": "6.2.1",
+    "postcss-loader": "7.0.0",
     "postcss-preset-env": "7.4.3",
     "preact": "10.7.1",
     "sass-loader": "12.6.0",

yarn.lock

@@ -26,7 +26,7 @@ __metadata:
     mustache: 4.2.0
     node-sass: 7.0.1
     postcss: 8.4.12
-    postcss-loader: 6.2.1
+    postcss-loader: 7.0.0
     postcss-preset-env: 7.4.3
     preact: 10.7.1
     sass-loader: 12.6.0
@@ -17663,17 +17663,17 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss-loader@npm:6.2.1":
-  version: 6.2.1
-  resolution: "postcss-loader@npm:6.2.1"
+"postcss-loader@npm:7.0.0":
+  version: 7.0.0
+  resolution: "postcss-loader@npm:7.0.0"
   dependencies:
     cosmiconfig: ^7.0.0
     klona: ^2.0.5
-    semver: ^7.3.5
+    semver: ^7.3.7
   peerDependencies:
     postcss: ^7.0.0 || ^8.0.1
     webpack: ^5.0.0
-  checksum: e40ae79c3e39df37014677a817b001bd115d8b10dedf53a07b97513d93b1533cd702d7a48831bdd77b9a9484b1ec84a5d4a723f80e83fb28682c75b5e65e8a90
+  checksum: b8e51e99898cae8400de8690752b64af2ca1e3eed7c0d696c9e1ec6fc45dd334c958748247632c48109a519fb59f7545d0b8fe4b52479d982ca3ec4eb8e3b0c9
   languageName: node
   linkType: hard
 
@@ -19333,6 +19333,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"semver@npm:^7.3.7":
+  version: 7.3.7
+  resolution: "semver@npm:7.3.7"
+  dependencies:
+    lru-cache: ^6.0.0
+  bin:
+    semver: bin/semver.js
+  checksum: 2fa3e877568cd6ce769c75c211beaed1f9fce80b28338cadd9d0b6c40f2e2862bafd62c19a6cff42f3d54292b7c623277bcab8816a2b5521cf15210d43e75232
+  languageName: node
+  linkType: hard
+
 "send@npm:0.17.1":
   version: 0.17.1
   resolution: "send@npm:0.17.1"