Fix variable name for GitHub output (#444)

Author: blink1073

.github/workflows/test.yml

@@ -128,6 +128,8 @@ jobs:
       - test
       - docs
       - pre-commit
+      - check_local_actions
+      - generate-changelog
     runs-on: ubuntu-latest
     steps:
       - name: Decide whether the needed jobs succeeded or failed

jupyter_releaser/util.py

@@ -397,8 +397,8 @@ def latest_draft_release(gh, branch=None):
 def actions_output(name, value):
     """Handle setting an action output on GitHub"""
     log(f"\n\nSetting output {name}={value}")
-    if "GITHUB_ENV" in os.environ:
-        with open("GITHUB_ENV", "a") as fid:
+    if "GITHUB_OUTPUT" in os.environ:
+        with open("GITHUB_OUTPUT", "a") as fid:
             fid.write(f"{name}={value}\n")