do not try to respond to cancelled requests #1069

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	30s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 36s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 44s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 7s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	3m 38s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 39s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	3m 17s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 33s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 49s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 57s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	3m 11s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 38s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	3m 11s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 35s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 41s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 41s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	3m 11s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 55s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	5m 58s
	46m 51s

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