setup.cfg: requests 2.32.0+ breaks requests-unixsocket

requests 2.32 security fix recommends a fix:
psf/requests#6710

This was proposed (but not yet merged) to requests-unixsocket in:
msabramo/requests-unixsocket#72

Signed-off-by: Simon Deziel <simon.deziel@canonical.com>

setup.cfg

@@ -20,7 +20,7 @@ packages = find:
 install_requires =
     cryptography >= 3.2
     python-dateutil >= 2.4.2
-    requests >= 2.20.0
+    requests >= 2.20.0, < 2.32.0
     requests-toolbelt >= 0.8.0
     requests-unixsocket >= 0.1.5
     urllib3 < 2