Bump actions/checkout from 3 to 4 #1022

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 25.x)	26s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	5m 3s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	5m 36s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	5m 2s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	4m 23s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	6m 52s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	4m 58s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	3m 43s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	5m 3s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	3m 54s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	9m 15s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	8m 3s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	5m 52s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	5m 53s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	8m 4s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	7m 59s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	5m 31s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	6m 40s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	6m 37s
	1h 48m 54s

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