Skip nightly lance benchmark (#7594)

It seems like I've added `lance` accidentally, and it break the nightly
TPC-H run on NVMe. From looking at the data I don't think we ever ran
Lance in that configuration.

Signed-off-by: Adam Gutglick <adam@spiraldb.com>

Author: AdamGS

.github/workflows/nightly-bench.yml

@@ -39,7 +39,6 @@ jobs:
             "develop_targets": [
               {"engine": "datafusion", "format": "parquet"},
               {"engine": "datafusion", "format": "vortex"},
-              {"engine": "datafusion", "format": "lance"},
               {"engine": "duckdb", "format": "parquet"},
               {"engine": "duckdb", "format": "vortex"}
             ],