fix: rss-to-bluesky のXMLエンティティ展開上限を無効化 (#1374)

fix: disable XML entity expansion limit in rss-to-bluesky

The default limit of 10000 was exceeded by jser.info/rss/
(10218 entities). Set to 0 (unlimited) since the feed source
is jser.info itself and trusted.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: azu

.github/workflows/rss-to-bluesky.yml

@@ -40,6 +40,7 @@ jobs:
           password: ${{ secrets.JSER_BLUESKY_PASSWORD }}
           cache-file: ${{ github.workspace }}/blueskyfeedbot/cache.json
           initial-post-limit: 1
+          xml-entity-expansion-limit: 0
 
   jser:
     runs-on: ubuntu-latest
@@ -73,3 +74,4 @@ jobs:
           password: ${{ secrets.JSER_BLUESKY_PASSWORD }}
           cache-file: ${{ github.workspace }}/blueskyfeedbot/cache.json
           initial-post-limit: 1
+          xml-entity-expansion-limit: 0