ci: add setuptools to pypy requirements

CI is complaining without this.

Author: indygreg

ci/requirements.pypy.in

@@ -5,3 +5,4 @@ colorama
 hypothesis
 pytest-xdist
 pytest
+setuptools

ci/requirements.pypy.txt

@@ -51,6 +51,10 @@ pytest-xdist==3.8.0 \
     --hash=sha256:202ca578cfeb7370784a8c33d6d05bc6e13b4f25b5053c30a152269fd10f0b88 \
     --hash=sha256:7e578125ec9bc6050861aa93f2d59f1d8d085595d6551c2c90b6f4fad8d3a9f1
     # via -r ci/requirements.pypy.in
+setuptools==80.9.0 \
+    --hash=sha256:062d34222ad13e0cc312a4c02d73f059e86a4acbfbdea8f8f76b28c99f306922 \
+    --hash=sha256:f36b47402ecde768dbfafc46e8e4207b4360c654f1f3bb84475f0a28628fb19c
+    # via -r ci/requirements.pypy.in
 sortedcontainers==2.4.0 \
     --hash=sha256:25caa5a06cc30b6b83d11423433f65d1f9d76c4c6a0c90e3379eaa43b9bfdb88 \
     --hash=sha256:a163dcaede0f1c021485e957a39245190e74249897e2ae4b2aa38595db237ee0