Update dependency @fullhuman/postcss-purgecss to v4

package.json

@@ -2,7 +2,7 @@
   "name": "remotearn",
   "private": true,
   "dependencies": {
-    "@fullhuman/postcss-purgecss": "^2.3.0",
+    "@fullhuman/postcss-purgecss": "4.0.3",
     "@rails/actioncable": "^6.0.0",
     "@rails/activestorage": "^6.0.0",
     "@rails/ujs": "^6.0.0",

yarn.lock

@@ -804,7 +804,14 @@
   resolved "https://registry.yarnpkg.com/@csstools/convert-colors/-/convert-colors-1.4.0.tgz#ad495dc41b12e75d588c6db8b9834f08fa131eb7"
   integrity sha512-5a6wqoJV/xEdbRNKVo6I4hO3VjyDq//8q2f9I6PBAvMesJHFauXDorcNCsr9RzvsZnaWi5NYCcfyqP1QeFHFbw==
 
-"@fullhuman/postcss-purgecss@^2.1.2", "@fullhuman/postcss-purgecss@^2.3.0":
+"@fullhuman/postcss-purgecss@4.0.3":
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/@fullhuman/postcss-purgecss/-/postcss-purgecss-4.0.3.tgz#55d71712ec1c7a88e0d1ba5f10ce7fb6aa05beb4"
+  integrity sha512-/EnQ9UDWGGqHkn1UKAwSgh+gJHPKmD+Z+5dQ4gWT4qq2NUyez3zqAfZNwFH3eSgmgO+wjTXfhlLchx2M9/K+7Q==
+  dependencies:
+    purgecss "^4.0.3"
+
+"@fullhuman/postcss-purgecss@^2.1.2":
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/@fullhuman/postcss-purgecss/-/postcss-purgecss-2.3.0.tgz#50a954757ec78696615d3e118e3fee2d9291882e"
   integrity sha512-qnKm5dIOyPGJ70kPZ5jiz0I9foVOic0j+cOzNDoo8KoCf6HjicIZ99UfO2OmE7vCYSKAAepEwJtNzpiiZAh9xw==
@@ -1952,6 +1959,11 @@ color@^3.0.0, color@^3.1.2:
     color-convert "^1.9.1"
     color-string "^1.5.2"
 
+colorette@^1.2.2:
+  version "1.2.2"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.2.tgz#cbcc79d5e99caea2dbf10eb3a26fd8b3e6acfa94"
+  integrity sha512-MKGMzyfeuutC/ZJ1cba9NqcNpfeqMUcYmyF1ZFY6/Cn7CNSAKx6a+s48sqLqyAiZuaP2TcqMhoo+dlwFnVxT9w==
+
 combined-stream@^1.0.6, combined-stream@~1.0.6:
   version "1.0.8"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.8.tgz#c3d45a8b34fd730631a110a8a2520682b31d5a7f"
@@ -1969,6 +1981,11 @@ commander@^5.0.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-5.1.0.tgz#46abbd1652f8e059bddaef99bbdcb2ad9cf179ae"
   integrity sha512-P0CysNDQ7rtVw4QIQtm+MRxV66vKFSvlsQvGYXZWR3qFU0jlMKHZZZgw8e+8DSah4UDKMqnknRDQz+xuQXQ/Zg==
 
+commander@^6.0.0:
+  version "6.2.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-6.2.1.tgz#0792eb682dfbc325999bb2b84fddddba110ac73c"
+  integrity sha512-U7VdrJFnJgo4xjrHpTzu0yrHPGImdsmD95ZlgYSEajAn2JKzDhDTPG9kBTefmObL2w/ngeZnilk+OV9CG3d7UA==
+
 commondir@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/commondir/-/commondir-1.0.1.tgz#ddd800da0c66127393cca5950ea968a3aaf1253b"
@@ -4636,6 +4653,11 @@ nan@^2.12.1, nan@^2.13.2:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.1.tgz#d7be34dfa3105b91494c3147089315eff8874b01"
   integrity sha512-isWHgVjnFjh2x2yuJ/tj3JbwoHu3UC2dX5G/88Cm24yB6YopVgxvBObDY7n5xW6ExmFhJpSEQqFPvq9zaXc8Jw==
 
+nanoid@^3.1.23:
+  version "3.1.23"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.23.tgz#f744086ce7c2bc47ee0a8472574d5c78e4183a81"
+  integrity sha512-FiB0kzdP0FFVGDKlRLEQ1BgDzU87dy5NnzjeW9YZNt+/c3+q82EQDUwniSAUxp/F0gFNI1ZhKU1FqYsMuqZVnw==
+
 nanomatch@^1.2.9:
   version "1.2.13"
   resolved "https://registry.yarnpkg.com/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
@@ -5987,6 +6009,15 @@ postcss@^6.0.9:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
+postcss@^8.2.1:
+  version "8.2.15"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.15.tgz#9e66ccf07292817d226fc315cbbf9bc148fbca65"
+  integrity sha512-2zO3b26eJD/8rb106Qu2o7Qgg52ND5HPjcyQiK2B98O388h43A448LCslC0dI2P97wCAQRJsFvwTRcXxTKds+Q==
+  dependencies:
+    colorette "^1.2.2"
+    nanoid "^3.1.23"
+    source-map "^0.6.1"
+
 prepend-http@^1.0.0:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-1.0.4.tgz#d4f4562b0ce3696e41ac52d0e002e57a635dc6dc"
@@ -6102,6 +6133,16 @@ purgecss@^2.3.0:
     postcss "7.0.32"
     postcss-selector-parser "^6.0.2"
 
+purgecss@^4.0.3:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/purgecss/-/purgecss-4.0.3.tgz#8147b429f9c09db719e05d64908ea8b672913742"
+  integrity sha512-PYOIn5ibRIP34PBU9zohUcCI09c7drPJJtTDAc0Q6QlRz2/CHQ8ywGLdE7ZhxU2VTqB7p5wkvj5Qcm05Rz3Jmw==
+  dependencies:
+    commander "^6.0.0"
+    glob "^7.0.0"
+    postcss "^8.2.1"
+    postcss-selector-parser "^6.0.2"
+
 q@^1.1.2:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"