bump(slack): 77a10794 → 1251c73c (#5552)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.claude-plugin/marketplace.json

@@ -3361,7 +3361,7 @@
       "source": {
         "source": "url",
         "url": "https://github.com/slackapi/slack-mcp-plugin.git",
-        "sha": "77a10794d6fc2be6cc62261b28447ef27c0f3fff"
+        "sha": "1251c73cb0ef34d4ce66cada7d045751fc1d1edc"
       },
       "homepage": "https://github.com/slackapi/slack-mcp-plugin/tree/main"
     },