[gh actions] fixed typo

.github/workflows/test.yml

@@ -100,7 +100,7 @@ jobs:
       - name: Get short-lived Dropbox token
         # We generate a short-lived auth token which is passed to the test runner as
         # an environment variable. At no point does the test code, potentially from a
-        # malicious PR, get access to a long lived token.
+        # malicious PR, get access to a long-lived token.
         run: |
           auth_result=$(curl https://api.dropbox.com/oauth2/token \
               -d grant_type=refresh_token \