Pin setuptools<81 so awscliv2 keeps pkg_resources

awscliv2==2.1.1 imports pkg_resources, which setuptools>=81 removed. The
fresh CI docker image (rebuilt by the torch bump) picked up a newer setuptools,
breaking `awsv2 -i` at the start of .jenkins/build.sh. Unrelated to torch 2.13.

Co-authored-by: Claude

Author: atalman

.ci/docker/requirements.txt

@@ -32,6 +32,8 @@ torchdata
 networkx
 PyHamcrest
 bs4
+# Pin setuptools: awscliv2==2.1.1 imports pkg_resources, which setuptools>=81 removed.
+setuptools<81
 awscliv2==2.1.1
 flask
 spacy==3.7.1  # Keep this version consistent with the model version in .jenkins/build.sh