ci: Fix stalebot config (backport tendermint#131) (tendermint#146)

* ci: Fix stalebot config (tendermint#131)

I noticed that stalebot wasn't respecting our `wip` label, only to realize I hadn't yet updated its config.

---

#### PR checklist

- [x] Tests written/updated, or no tests needed
- [x] `CHANGELOG_PENDING.md` updated, or no changelog entry needed
- [x] Updated relevant documentation (`docs/`) and code comments, or no
      documentation updates needed

(cherry picked from commit 9975bc8)

# Conflicts:
#	.github/workflows/stale.yml

* Resolve conflicts

Signed-off-by: Thane Thomson <connect@thanethomson.com>

Signed-off-by: Thane Thomson <connect@thanethomson.com>
Co-authored-by: Thane Thomson <connect@thanethomson.com>

.github/workflows/stale.yml

@@ -13,6 +13,8 @@ jobs:
           stale-pr-message: "This pull request has been automatically marked as stale because it has not had
     recent activity. It will be closed if no further activity occurs. Thank you
     for your contributions."
-          days-before-stale: 10
-          days-before-close: 4
-          exempt-pr-labels: "S:wip"
+          days-before-stale: -1
+          days-before-close: -1
+          days-before-pr-stale: 10
+          days-before-pr-close: 4
+          exempt-pr-labels: "wip"