Update Dart Sass version and release

Author: sassbot

CHANGELOG.md

@@ -1,3 +1,12 @@
+## 1.51.0
+
+* **Potentially breaking change**: Change the order of maps returned by
+  `map.deep-merge()` to match those returned by `map.merge()`. All keys that
+  appeared in the first map will now be listed first in the same order they
+  appeared in that map, followed by any new keys added from the second map.
+
+* Improve the string output of some AST nodes in error messages.
+
 ## 1.50.1
 
 ### Embedded Sass

pubspec.lock

@@ -315,7 +315,7 @@ packages:
       name: sass
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.50.1"
+    version: "1.51.0"
   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.42"
+    version: "1.0.0-beta.43"
   shelf:
     dependency: transitive
     description:

pubspec.yaml

@@ -1,5 +1,5 @@
 name: sass_embedded
-version: 1.50.1
+version: 1.51.0
 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: 1.50.1
+  sass: 1.51.0
   sass_api: ^1.0.0-beta.5
   source_span: ^1.1.0
   stack_trace: ^1.6.0