Replace probot/stale with official stale action

[mroderick]

The probot action is no longer listed in their catalog, clearly hasn't been working for awhile and isn't maintained anymore.

Let's hope the official one will be working for awhile 🤞.

See:

• https://github.com/probot/probot.github.io/pull/376
• https://probot.github.io/apps/stale/
• https://github.com/probot/stale

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ef76b5b) 95.95% compared to head (2aad183) 95.95%.

:exclamation: Current head 2aad183 differs from pull request most recent head 44165ee. Consider uploading reports for the commit 44165ee to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2494 +/- ## ======================================= Coverage 95.95% 95.95% ======================================= Files 38 38 Lines 1878 1878 ======================================= Hits 1802 1802 Misses 76 76 ``` | Flag | Coverage Δ | | |---|---|---| | unit | `95.95% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sinonjs#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sinonjs). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sinonjs)

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