update dart versions in CI

Author: robbecker-wf

.github/workflows/dart_ci.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        sdk: [ 2.13.4, stable, dev ]
+        sdk: [ 2.18.7, 2.19.6 ]
     steps:
       - uses: actions/checkout@v2
       - uses: dart-lang/[email protected]
@@ -88,7 +88,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        sdk: [ 2.13.4, stable ]
+        sdk: [ 2.18.7, 2.19.6 ]
     steps:
       - uses: actions/checkout@v2
       - uses: dart-lang/[email protected]

Dockerfile

@@ -1,4 +1,4 @@
-FROM google/dart:2.13 as dart2
+FROM dart:2.18 as dart2
 # Build Environment Vars
 ARG BUILD_ID
 ARG BUILD_NUMBER