Ensure minimal nbconvert support jinja2 v2 & v3 (#756)

Co-authored-by: Steven Silvester <[email protected]>

Author: fcollonval

setup.cfg

@@ -33,11 +33,11 @@ install_requires =
     tornado>=6.1.0
     pyzmq>=17
     argon2-cffi
-    traitlets>=5
-    jupyter_core>=4.6.0
-    jupyter_client>=6.1.1
+    traitlets>=5.1.0
+    jupyter_core>=4.7.0
+    jupyter_client>=6.1.12
     nbformat>=5.2.0
-    nbconvert
+    nbconvert>=6.4.4
     Send2Trash
     terminado>=0.8.3
     prometheus_client