📎 Change output feature set to :es2020 on test compiler options

backend/deps.edn

@@ -10,7 +10,6 @@
   com.github.luben/zstd-jni {:mvn/version "1.5.2-3"}
   org.clojure/data.fressian {:mvn/version "1.0.0"}
 
-
   io.prometheus/simpleclient {:mvn/version "0.15.0"}
   io.prometheus/simpleclient_hotspot {:mvn/version "0.15.0"}
   io.prometheus/simpleclient_jetty {:mvn/version "0.15.0"

frontend/shadow-cljs.edn

@@ -90,7 +90,7 @@
    :autorun true
 
    :compiler-options
-   {:output-feature-set :es8
+   {:output-feature-set :es2020
     :output-wrapper false
     :source-map true
     :source-map-include-sources-content true