remove redundant & outdated info in workflow (#3076)

- stale + closing message contains outdated time
- remove mention of how long it has been to simplify it.

.github/workflows/close-old-issues.yaml

@@ -28,8 +28,8 @@ jobs:
         days-before-pr-stale: -1
         days-before-pr-close: -1
         # Sends a message for both the Stale and Close events of an issue.
-        stale-issue-message: "This issue was marked as stale because it has been inactive for 7 days"
-        close-issue-message: "This issue was closed because it has been inactive for 7 days since it was marked as stale"
+        stale-issue-message: "This issue was marked as stale due to inactivity."
+        close-issue-message: "This issue was closed after remaining stale without updates."
         # Increase this value if the project receives a lot of
         # PRs (yes.. apparently they're processed no matter what) & Issues.
         # Default value for it (according to the docs) is 30