Bump actions/checkout from 3 to 4 (#278) #457

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	57s
mix test (Elixir 1.12.x \| Erlang/OTP 22.x)	37s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 29s
mix test (Elixir 1.12.x \| Erlang/OTP 23.x)	42s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 24s
mix test (Elixir 1.12.x \| Erlang/OTP 24.x)	37s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 31s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	35s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 24s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	44s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 43s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	39s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 18s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	38s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 44s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	42s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 23s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	37s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 15s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	38s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 15s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	38s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 22s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	35s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	37s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	38s
	25m 42s

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