Revert "Pin end-to-end test Python dependencies" (#8106)

* Revert "Fix end-to-end tests (synapse setup) (#7420)"

This reverts commit b90a0c443d.

* Re-apply the modernized pip install approach

* setuptools2

test/end-to-end-tests/element/install-webserver.sh

@@ -10,10 +10,7 @@ cd $BASE_DIR
     source env/bin/activate
 
     pip install --upgrade pip
-
-    # Pin setuptools to work around crash bug in v60
-    # See https://github.com/vector-im/element-web/issues/20287
-    pip install setuptools==v59.8.0
+    pip install --upgrade setuptools
 
     pip install ComplexHttpServer