Downgrade flutter sdk versions. (#1305)

scripts/dart/add-punctuations-pubspec.yaml

@@ -6,7 +6,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   sherpa_onnx:

scripts/dart/audio-tagging-pubspec.yaml

@@ -6,7 +6,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   sherpa_onnx:

scripts/dart/kws-pubspec.yaml

@@ -6,7 +6,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   sherpa_onnx:

scripts/dart/non-streaming-asr-pubspec.yaml

@@ -5,7 +5,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 # Add regular dependencies here.
 dependencies:

scripts/dart/sherpa-onnx-pubspec.yaml

@@ -22,8 +22,7 @@ version: 1.10.20
 homepage: https://github.com/k2-fsa/sherpa-onnx
 
 environment:
-  sdk: '>=3.4.0 <4.0.0'
-  flutter: '>=3.3.0'
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   ffi: ^2.1.0

scripts/dart/speaker-id-pubspec.yaml

@@ -6,7 +6,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   sherpa_onnx:

scripts/dart/streaming-asr-pubspec.yaml

@@ -7,7 +7,7 @@ version: 1.0.0
 # repository: https://github.com/my_org/my_repo
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 # Add regular dependencies here.
 dependencies:

scripts/dart/tts-pubspec.yaml

@@ -4,7 +4,7 @@ version: 1.0.0
 # repository: https://github.com/my_org/my_repo
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 # Add regular dependencies here.
 dependencies:

scripts/dart/vad-non-streaming-asr-pubspec.yaml

@@ -7,7 +7,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   sherpa_onnx:

scripts/dart/vad-pubspec.yaml

@@ -6,7 +6,7 @@ description: >
 version: 1.0.0
 
 environment:
-  sdk: ^3.4.0
+  sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
   sherpa_onnx: