[ffigen] Update pubspec of examples (#367)

diff --git a/pkgs/ffigen/example/c_json/pubspec.yaml b/pkgs/ffigen/example/c_json/pubspec.yaml
index 9493d21..4a29269 100644
--- a/pkgs/ffigen/example/c_json/pubspec.yaml
+++ b/pkgs/ffigen/example/c_json/pubspec.yaml

@@ -5,10 +5,10 @@
 name: c_json_example
 
 environment:
-  sdk: '>=2.13.0 <3.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 dependencies:
-  ffi: ^1.2.0-dev.0
+  ffi: ^1.1.2
   path: ^1.8.0
 
 dev_dependencies:

diff --git a/pkgs/ffigen/example/libclang-example/pubspec.yaml b/pkgs/ffigen/example/libclang-example/pubspec.yaml
index 4a0829b..692c26c 100644
--- a/pkgs/ffigen/example/libclang-example/pubspec.yaml
+++ b/pkgs/ffigen/example/libclang-example/pubspec.yaml

@@ -5,10 +5,10 @@
 name: libclang_example
 
 environment:
-  sdk: '>=2.16.0-124.0.dev <3.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 dependencies:
-  ffi: ^1.2.0-dev.0
+  ffi: ^1.1.2
 dev_dependencies:
   ffigen:
     path: '../../'

diff --git a/pkgs/ffigen/example/simple/pubspec.yaml b/pkgs/ffigen/example/simple/pubspec.yaml
index b7b8823..f55489d 100644
--- a/pkgs/ffigen/example/simple/pubspec.yaml
+++ b/pkgs/ffigen/example/simple/pubspec.yaml

@@ -5,10 +5,10 @@
 name: simple_example
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.17.0 <3.0.0'
 
 dependencies:
-  ffi: ^1.2.0-dev.0
+  ffi: ^1.1.2
 dev_dependencies:
   ffigen:
     path: '../../'