Fix requests version in python-script

`httpie` uses an upper limit, so we must use the same constraint for
pip to install it.

images/python-script/requirements.txt

@@ -2,7 +2,8 @@ pip==24.2
 numpy==2.1.0
 httpie==3.2.3
 pyforgejo==1.0.2
-requests==2.32.3
+# httpie restricts this, so we need to do the same
+requests<2.31.0
 spotify==0.10.2
 xq==0.0.4
 docker==7.1.0