fix(ci): Update Qt version to latest

.gitea/workflows/pin-check.yaml

@@ -0,0 +1,26 @@
+name: Upstream pin check
+
+on:
+  schedule:
+    - cron: "0 6 * * 1" # Mondays 06:00 UTC — catches upstream/Qt drift between ISO builds
+  workflow_dispatch:
+  push:
+    paths:
+      - "localrepo/end4-pkgbuilds/quickshell-git/PKGBUILD"
+      - "localrepo/check-quickshell-pin.sh"
+      - "airootfs/root/customize_airootfs.sh"
+      - ".gitea/workflows/pin-check.yaml"
+
+jobs:
+  quickshell-pin:
+    runs-on: archlinux
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+
+      # Tripwire for the failure mode that broke ISO build run 137:
+      # a quickshell pin (ours or end-4's) that predates a Qt compat fix
+      # or has simply gone stale. Fails the job so the drift is visible
+      # in Actions instead of surfacing as a 3-hour ISO build failure.
+      - name: Check quickshell pins
+        run: ./localrepo/check-quickshell-pin.sh