Bump eec-campaigns pin to v0.1.4

v0.1.4 fixes several bugs found while testing on twosquirrelspress-campaigns:
- test-send failed validation on empty name/messenger fields (v0.1.1, v0.1.2)
- campaigns went out HTML-only; listmonk never derives a plaintext
  alternative on its own, so altbody is now sent explicitly (v0.1.3)
- change-detection now tracks altbody so campaigns synced before this
  fix actually pick it up on their next sync (v0.1.4)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitea/workflows/sync-template.yml

@@ -13,7 +13,7 @@ jobs:
           go-version: "1.23.1"
 
       - name: Install eec-campaigns
-        run: go install gitea.reground.org/will/eec-campaigns@v0.1.0
+        run: go install gitea.reground.org/will/eec-campaigns@v0.1.4
 
       - name: Sync template to listmonk
         run: eec-campaigns template "cateconners default" email-templates/campaign.html