vterm mode: Key sequence C-c C-z starts with non-prefix key C-c

[muralikodali]

message buffer showing the following error with the key mapping related to vterm-mode binding to a function evil-collection-vterm-toggle-send-escape

evil-collection: error setting key in vterm-mode-map (error "Key sequence C-c C-z starts with non-prefix key C-c")

keeping C-c C-z key in block list keeps this message away from appearing in message buffer.