change node version

Author: pavelglac

.azure-devops/release.yaml

@@ -42,6 +42,10 @@ extends:
               os: linux
             steps:
               - checkout: self
+              - task: NodeTool@0
+                displayName: "Installing node"
+                inputs:
+                  versionSpec: "12"
               - script: yarn --frozen-lockfile
                 displayName: yarn
               - script: yarn ci-test