Update dart sdk version in CI

Author: shilangyu

.github/workflows/leancode_contracts-publish.yml

@@ -21,7 +21,7 @@ jobs:
 
       - uses: dart-lang/setup-dart@v1
         with:
-          sdk: 2.19.2
+          sdk: 3.1.0
 
       - name: Publish to pub.dev
         run: |

.github/workflows/leancode_contracts-test.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        dart_sdk: ["2.17.5", "2.18.2", "2.19.0", "3.0.0"]
+        dart_sdk: ["3.0.7", "3.1.0"]
 
     defaults:
       run:

.github/workflows/leancode_contracts_generator-publish.yml

@@ -23,7 +23,7 @@ jobs:
 
       - uses: dart-lang/setup-dart@v1
         with:
-          sdk: 2.19.2
+          sdk: 3.1.0
 
       - name: Publish to pub.dev
         run: |

.github/workflows/leancode_contracts_generator-test.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        dart_sdk: ["2.19.0", "3.0.0"]
+        dart_sdk: ["3.0.7", "3.1.0"]
 
     runs-on: ubuntu-latest