Migrate deprecated cirrus-module v2 to v3 (#404)

.cirrus.star

@@ -1,4 +1,4 @@
-load("github.com/SonarSource/cirrus-modules@v2", "load_features")
+load("github.com/SonarSource/cirrus-modules@v3", "load_features")
 
 def main(ctx):
   return load_features(ctx)

.cirrus.yml

@@ -31,20 +31,19 @@ only_main_branches: &ONLY_MAIN_BRANCHES
   skip: "changesIncludeOnly('README.md')"
   only_if: $CIRRUS_USER_COLLABORATOR == 'true' && $CIRRUS_TAG == "" && ($CIRRUS_BRANCH == $CIRRUS_DEFAULT_BRANCH || $CIRRUS_BRANCH =~ "branch-.*")
 
-eks_container: &CONTAINER_DEFINITION
+container_definition: &CONTAINER_DEFINITION
   image: ${CIRRUS_AWS_ACCOUNT}.dkr.ecr.eu-central-1.amazonaws.com/base:j17-latest
   region: eu-central-1
   cluster_name: ${CIRRUS_CLUSTER_NAME}
   namespace: default
   cpu: 4
   memory: 4G
 
-ec2_instance: &WINVM_DEFINITION
+ec2_instance_definition: &WINVM_DEFINITION
   experimental: true
   image: base-windows-jdk17-v*
   platform: windows
   region: eu-central-1
-  subnet_id: ${CIRRUS_AWS_SUBNET}
   type: t3.large
 
 maven_cache: &MAVEN_CACHE