Update stylelint + fix errors

.stylelintrc.yaml

@@ -2,6 +2,7 @@ extends:
   - stylelint-prettier/recommended
   - stylelint-config-recommended
   - stylelint-config-recommended-scss
+  - stylelint-stylistic/config
 
 ignoreFiles:
   - indico/web/static/dist/**/*.css
@@ -43,7 +44,6 @@ rules:
 
   value-keyword-case: lower
 
-  scss/at-import-no-partial-leading-underscore: true
   scss/at-import-partial-extension: never
   scss/at-function-pattern: ^([a-z][a-z0-9]*)(-[a-z0-9]+)*$
   scss/at-mixin-argumentless-call-parentheses: always
@@ -54,6 +54,7 @@ rules:
   scss/double-slash-comment-whitespace-inside: always
   scss/declaration-nested-properties: never
   scss/dimension-no-non-numeric-values: true
+  scss/load-no-partial-leading-underscore: true
   scss/media-feature-value-dollar-variable:
     - always
     - ignore: [keywords]
@@ -72,3 +73,13 @@ rules:
   scss/at-extend-no-missing-placeholder: null
   # prettier's formatting can violate this
   scss/operator-no-newline-after: null
+  # single quotes are clearly superior
+  stylistic/string-quotes: single
+
+  # these rule conflict with stylelint-prettier formatting
+  stylistic/indentation: null
+  stylistic/selector-descendant-combinator-no-non-space: null
+  stylistic/declaration-colon-newline-after: null
+  stylistic/selector-combinator-space-before: null
+  stylistic/block-closing-brace-newline-after: null
+  stylistic/value-list-comma-newline-after: null

cloud_captchas/indico_cloud_captchas/client/CloudCaptcha.module.scss

@@ -25,7 +25,7 @@
   }
 
   :global(.field.error) iframe {
-    border: 1px solid #cc0000;
+    border: 1px solid #c00;
   }
 }
 

owncloud/indico_owncloud/client/style.scss

@@ -14,7 +14,7 @@ form#attachment-owncloudfilepicker-form.full-width .owncloudfilepicker {
 }
 
 .owncloudfilepicker {
-  border: 0px none;
+  border: 0 none;
   width: 100%;
 }
 

package.json

@@ -19,10 +19,11 @@
     "eslint-plugin-react-hooks": "^4.6.0",
     "lodash": "^4.17.21",
     "prettier": "~1.18.2",
-    "stylelint": "^14.9.1",
-    "stylelint-config-prettier": "^9.0.3",
-    "stylelint-config-recommended-scss": "^6.0.0",
+    "stylelint": "^15.11.0",
+    "stylelint-config-prettier": "^9.0.5",
+    "stylelint-config-recommended-scss": "^13.1.0",
     "stylelint-prettier": "^1.2.0",
-    "stylelint-scss": "^4.2.0"
+    "stylelint-scss": "^5.3.2",
+    "stylelint-stylistic": "^0.4.5"
   }
 }