fix off by one error #981

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	19s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	8m 22s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	10m 38s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	7m 48s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	6m 7s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	10m 6s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	6m 40s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	5m 46s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	6m 48s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	5m 50s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	5m 40s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	7m 57s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	5m 35s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	4m 6s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	6m 22s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	4m 28s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	55s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	4m 29s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	4m 51s
	1h 52m 47s

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