stable null safety release (dart-lang/yaml#106)

pkgs/yaml/CHANGELOG.md

diff --git a/pkgs/yaml/CHANGELOG.md b/pkgs/yaml/CHANGELOG.md
index 5817dd0..9d6fef4 100644
--- a/pkgs/yaml/CHANGELOG.md
+++ b/pkgs/yaml/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.0.0
+
+* Stable null safety release.
+
 ## 3.0.0-nullsafety.0
 
 * Updated to support 2.12.0 and null safety.

pkgs/yaml/pubspec.yaml

diff --git a/pkgs/yaml/pubspec.yaml b/pkgs/yaml/pubspec.yaml
index 4117657..069d3da 100644
--- a/pkgs/yaml/pubspec.yaml
+++ b/pkgs/yaml/pubspec.yaml
@@ -1,5 +1,5 @@
 name: yaml
-version: 3.0.0-nullsafety.0
+version: 3.0.0
 
 description: A parser for YAML, a human-friendly data serialization standard
 homepage: https://github.com/dart-lang/yaml
@@ -8,23 +8,12 @@
   sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  charcode: ^1.2.0-nullsafety
-  collection: ^1.15.0-nullsafety
-  source_span: ^1.8.0-nullsafety
-  string_scanner: ^1.1.0-nullsafety
+  charcode: ^1.2.0
+  collection: ^1.15.0
+  source_span: ^1.8.0
+  string_scanner: ^1.1.0
 
 dev_dependencies:
-  path: ^1.8.0-nullsafety
-  pedantic: ^1.10.0-nullsafety
+  path: ^1.8.0
+  pedantic: ^1.10.0
   test: ^1.16.0-nullsafety
-
-  # Temporary deps to allow overrides
-  test_core: any
-  test_api: any
-  analyzer: any
-
-dependency_overrides:
-  analyzer: ^0.41.0
-  test: ^1.16.0-nullsafety
-  test_api: ^0.2.19-nullsafety
-  test_core: ^0.3.12-nullsafety