Downgrade git-town

.github/dependabot.yml

@@ -9,6 +9,14 @@ updates:
       actions:
         patterns:
           - "*"
+    ignore:
+      # git-town/action v1.3.x crashes on cyclic PR graphs (self-loop main->main
+      # fork PRs) via its topological-sort visualization. Pinned to v1.2.1 in
+      # git-town.yml; block v1.3.x until upstream tolerates cyclic edges.
+      - dependency-name: "git-town/action"
+        update-types:
+          - "version-update:semver-minor"
+          - "version-update:semver-major"
 
   - package-ecosystem: "gomod"
     directories:

.github/workflows/git-town.yml

@@ -18,6 +18,6 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: git-town/action@670e1f4feb81fdef4226fc09deefe09018eb20d1 # v1.3.3
+      - uses: git-town/action@3d8b878379abb1ee393fb49865a28b4a6c2cd3b0 # v1.2.1
         with:
           skip-single-stacks: true