chore: use lance-namespace in lance main repo (#2729)

This fully fixes the duplicated lance version issue without the need of
a patch section in Cargo

ci/set_lance_version.py

@@ -117,7 +117,7 @@ def update_cargo_toml(line_updater):
     lance_line = ""
     is_parsing_lance_line = False
     for line in lines:
-        if line.startswith("lance") and not line.startswith("lance-namespace"):
+        if line.startswith("lance"):
             # Check if this is a single-line or multi-line entry
             # Single-line entries either:
             # 1. End with } (complete inline table)