🎨 Stopped Renovate from recreating immortal PRs

Renovate kept recreating grouped PRs such as babel, storybook,
CSS preprocessors and tailwind even after they were manually closed
and their branches were deleted. The logs showed Ghost's
recreateClosed=false was being normalized to recreateWhen=auto, which
still allows Renovate to recreate immortal grouped PRs.

Switching to recreateWhen=never matches Renovate's documented way to
keep immortal PRs closed while still allowing intentional reopening
from the Dependency Dashboard when we want to work through them.

Author: ErisDS

.github/renovate.json5

@@ -7,9 +7,9 @@
     // The shared preset disables rate limiting, but Ghost's monorepo is
     // large enough that unlimited branches cause timeouts during rebasing.
     "branchConcurrentLimit": 10,
-    // Don't recreate PRs that have been manually closed. Updates can still
-    // be triggered on-demand via the Dependency Dashboard checkboxes.
-    "recreateClosed": false,
+    // Keep manually-closed immortal/grouped PRs closed unless explicitly
+    // reopened from the Dependency Dashboard.
+    "recreateWhen": "never",
     // We have to disable platform based automerge (forcing renovate to do it manually)
     // as otherwise renovate wont follow our schedule
     "platformAutomerge": false,