build: use $GITHUB_OUTPUT for environment list

Author: dougwilson

.github/workflows/ci.yml

@@ -155,7 +155,7 @@ jobs:
         echo "node@$(node -v)"
         echo "npm@$(npm -v)"
         npm -s ls ||:
-        (npm -s ls --depth=0 ||:) | awk -F'[ @]' 'NR>1 && $2 { print "::set-output name=" $2 "::" $3 }'
+        (npm -s ls --depth=0 ||:) | awk -F'[ @]' 'NR>1 && $2 { print $2 "=" $3 }' >> "$GITHUB_OUTPUT"
 
     - name: Run tests
       shell: bash