fix: use tagged dart images in ci

.gitlab-ci.yml

@@ -10,7 +10,8 @@ workflow:
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
 
 variables:
-  FLUTTER_IMAGE_TAG: "3.0.5"
+  FLUTTER_IMAGE_TAG: "3.3.10"
+  DART_IMAGE_TAG: "2.18.6"
 
 coverage:
   stage: test
@@ -36,7 +37,7 @@ coverage:
 
 coverage_without_olm:
   stage: test
-  image: dart
+  image: dart:${DART_IMAGE_TAG}
   dependencies: []
   variables:
     NO_OLM: 1
@@ -100,14 +101,14 @@ e2ee_test:
 
 dry-run:
   stage: deploy
-  image: dart
+  image: dart:${DART_IMAGE_TAG}
   script:
     - dart pub get
     - dart pub publish --dry-run
 
 pub-dev:
   stage: deploy
-  image: dart
+  image: dart:${DART_IMAGE_TAG}
   dependencies: [dry-run]
   script:
     - |