tweak dependencies again

Author: p

.evergreen/run-tests.sh

@@ -140,7 +140,12 @@ if test -n "$FLE"; then
     # We already have a virtualenv activated for mlaunch,
     # install kms dependencies into it.
     #. .evergreen/csfle/activate_venv.sh
-    pip install boto3~=1.19 cryptography~=3.4.8 pykmip~=0.10.0
+    
+    # Adjusted package versions:
+    # cryptography 3.4 requires rust, see
+    # https://github.com/pyca/cryptography/issues/5771.
+    #pip install boto3~=1.19 cryptography~=3.4.8 pykmip~=0.10.0
+    pip3 install boto3~=1.19 'cryptography<3.4' pykmip~=0.10.0
   fi
   python3 -u .evergreen/csfle/kms_http_server.py --ca_file .evergreen/x509gen/ca.pem --cert_file .evergreen/x509gen/server.pem --port 7999 &
   python3 -u .evergreen/csfle/kms_http_server.py --ca_file .evergreen/x509gen/ca.pem --cert_file .evergreen/x509gen/expired.pem --port 8000 &