Update Dart Sass version and release

Author: sassbot

CHANGELOG.md

@@ -1,3 +1,17 @@
+## 1.53.0
+
+* Add support for calling `var()` with an empty second argument, such as
+  `var(--side, )`.
+
+### JS API
+
+* Fix a bug where `meta.load-css()` would sometimes resolve relative URLs
+  incorrectly when called from a mixin using the legacy JS API.
+
+### Embedded Sass
+
+* Respect npm's proxy settings when downloading the embedded Sass compiler.
+
 ## 1.52.3
 
 * Fix crash when trailing loud comments (`/* ... */`) appear twice in a row

pubspec.lock

@@ -315,7 +315,7 @@ packages:
       name: sass
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.52.3"
+    version: "1.53.0"
   sass_analysis:
     dependency: "direct dev"
     description:
@@ -331,7 +331,7 @@ packages:
       name: sass_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0-beta.48"
+    version: "1.0.0"
   shelf:
     dependency: transitive
     description:

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass_embedded
-version: 1.52.3
+version: 1.53.0
 description: An implementation of the Sass embedded protocol using Dart Sass.
 homepage: https://github.com/sass/dart-sass-embedded
 
@@ -14,7 +14,7 @@ dependencies:
   meta: ^1.1.0
   path: ^1.6.0
   protobuf: ^2.0.0
-  sass: 1.52.3
+  sass: 1.53.0
   sass_api: ^1.0.0-beta.5
   source_span: ^1.1.0
   stack_trace: ^1.6.0