attestations: missing param

Signed-off-by: William Woodruff <[email protected]>

attestations.py

@@ -93,4 +93,4 @@ def attest_dist(dist: Path, signer: Signer) -> None:
         if not dist.is_file():
             die(f"Path looks like a distribution but is not a file: {dist}")
 
-        attest_dist(dist)
+        attest_dist(dist, signer)