gitignore .tool-versions

[PragTob]

Kinda changed my opinion on this, it became annoying to upgrade patch versions on my other systems just to be in sync. Since this is a library that should work on many versions and runs CI that way there is no need for strict enforcement.

[PragTob]

Flakey where the runner was seemingly not fast enough:

   1) test warn when functions are evaluated warns when run in iex (BencheeTest)
Error:      test/benchee_test.exs:1042
     Assertion failed, no matching message after 20000ms
     The following variables were pinned:
       port = #Port<0.41>
     Showing 8 of 8 messages in the mailbox
     code: assert_receive {^port, {:data, "iex(2)> "}}
     mailbox:
       pattern: {^port, {:data, "iex(2)> "}}
       value:   {#Port<0.41>,
                 {:data,
                  "Interactive Elixir (1.15.8) - press Ctrl+C to exit (type h() ENTER for help)\n"}}

       pattern: {^port, {:data, "iex(2)> "}}
       value:   {#Port<0.41>,
                 {:data,
                  "Operating System: Linux\nCPU Information: AMD EPYC 7763 64-Core Processor\nNumber of Available Cores: 4\nAvailable memory: 15.62 GB\nElixir 1.15.8\nErlang 24.3.4.17\nJIT enabled: true\n\n"}}

       pattern: {^port, {:data, "iex(2)> "}}
       value:   {#Port<0.41>,
                 {:data,