Merge bitcoin#25070: contrib: fix dirname on verify-commits

ded915e contrib: fix dirname on `verify-commits` (brunoerg)

Pull request description:

  Fixes: https://github.com/bitcoin/bitcoin/runs/6309423255

ACKs for top commit:
  fanquake:
    ACK ded915e

Tree-SHA512: fbc46e907ec6151aca76360b471f0f34b9fc7d7eb054616df61feaf392bc4710dc26a965adb432e91e18498d446787c388c7989d07e4858d0fbf6bf28074b24c

Author: fanquake

contrib/verify-commits/verify-commits.py

@@ -88,7 +88,7 @@ def main():
         verified_sha512_root = f.read().splitlines()[0]
     with open(dirname + "/allow-revsig-commits", "r", encoding="utf8") as f:
         revsig_allowed = f.read().splitlines()
-    with open(dirname + "/allow-unclean-merge-commit", "r", encoding="utf8") as f:
+    with open(dirname + "/allow-unclean-merge-commits", "r", encoding="utf8") as f:
         unclean_merge_allowed = f.read().splitlines()
     with open(dirname + "/allow-incorrect-sha512-commits", "r", encoding="utf8") as f:
         incorrect_sha512_allowed = f.read().splitlines()