Remove unused s3transfer dependency (#18934)

requirements/prod.txt

@@ -331,9 +331,6 @@ redis==4.1.4 \
 requests==2.27.1 \
     --hash=sha256:f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d \
     --hash=sha256:68d7c56fd5a8999887728ef304a6d12edc7be74f1cfa47714fc8b414525c9a61
-s3transfer==0.5.1 \
-    --hash=sha256:25c140f5c66aa79e1ac60be50dcd45ddc59e83895f062a3aab263b870102911f \
-    --hash=sha256:69d264d3e760e569b78aaa0f22c97e955891cd22e32b10c51f784eeda4d9d10a
 # sgmllib3k is required by feedparser
 sgmllib3k==1.0.0 \
     --hash=sha256:7868fb1c8bfa764c1ac563d3cf369c381d1325d36124933a726f29fcdaa812e9