bump(spanner): 1a92c0f2 → 290f70f1 (#5348)

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

.claude-plugin/marketplace.json

@@ -3403,7 +3403,7 @@
       "source": {
         "source": "url",
         "url": "https://github.com/gemini-cli-extensions/spanner.git",
-        "sha": "1a92c0f2ee20e3c51c43e0a30e7ed40f303db2f9"
+        "sha": "290f70f172bb4841a91519b140deb35f97fd4a66"
       },
       "homepage": "https://github.com/gemini-cli-extensions/spanner"
     },