build: update elixir tool version

[dustinfarris]

The default 1.17.2 version from hex is built with OTP 25. mix test has a failure with this version.

  1) test &Oidcc.client_credentials_token/2 works (Oidcc.TokenTest)
     test/oidcc/token_test.exs:211
     match (=) failed
     code:  assert {:ok, %Token{}} =
              Oidcc.Token.client_credentials(
                client_context,
                %{scope: ["openid"]}
              )
     left:  {:ok, %Oidcc.Token{}}
     right: {:error, :no_matching_key}
     stacktrace:
       test/oidcc/token_test.exs:224: (test)

Updating to the OTP 27 build resolves this issue.

[maennchen]

@dustinfarris It seems unlikely, that this test is broken by that. Are you sure it’s not just flaky?

[dustinfarris]

@dustinfarris It seems unlikely, that this test is broken by that. Are you sure it’s not just flaky?

You are correct. It is flaky.

[maennchen]

@dustinfarris Can you open an issue about the test? We shouldn’t have flaky tests either…

[dustinfarris]

@dustinfarris Can you open an issue about the test? We shouldn’t have flaky tests either…

#389