Fix registry publish: update action to @main, bump to 2.6.3

- publish_action.yml: @v1 -> @main (20 commits of fixes behind)
- publish_action.yml: remove unnecessary permissions: issues: write
- pyproject.toml: 2.6.2 -> 2.6.3 to trigger fresh publish
- All 2.6.x versions stuck in NodeVersionStatusFlagged, likely due to stale action

.github/workflows/publish_action.yml

@@ -7,9 +7,6 @@ on:
     paths:
       - "pyproject.toml"
 
-permissions:
-  issues: write
-
 jobs:
   publish-node:
     name: Publish Custom Node to registry
@@ -19,6 +16,6 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v4
       - name: Publish Custom Node
-        uses: Comfy-Org/publish-node-action@v1
+        uses: Comfy-Org/publish-node-action@main
         with:
           personal_access_token: ${{ secrets.REGISTRY_ACCESS_TOKEN }}