Update the sdk lower bounds for analyzer, dds.

Change-Id: Ia7814d39ecdc87bf0c445c63e100b154703cd0a0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/241300
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Devon Carew <devoncarew@google.com>
diff --git a/pkg/analyzer/pubspec.yaml b/pkg/analyzer/pubspec.yaml
index bf5c078..f96ef44 100644
--- a/pkg/analyzer/pubspec.yaml
+++ b/pkg/analyzer/pubspec.yaml
@@ -4,7 +4,7 @@
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/analyzer
 
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=2.15.0 <3.0.0'
 
 dependencies:
   _fe_analyzer_shared: ^39.0.0
diff --git a/pkg/dds/pubspec.yaml b/pkg/dds/pubspec.yaml
index ba302d5..e2ca11c 100644
--- a/pkg/dds/pubspec.yaml
+++ b/pkg/dds/pubspec.yaml
@@ -6,7 +6,7 @@
 repository: https://github.com/dart-lang/sdk/tree/main/pkg/dds
 
 environment:
-  sdk: '>=2.14.0 <3.0.0'
+  sdk: '>=2.15.0 <3.0.0'
 
 dependencies:
   args: ^2.0.0