[Fix] Update credo and add note on Elixir versions compatibility

[joaquinco]

Dependencies changes

• Update credo (and bamboo because of a shared dependency mime) because it was raising an error locally with the locked version
• Update credo config file from the default configuration

CI changes

• Lint only the last version on the CI pipeline
• Remove e2e tests from code checks step
• Remove Elixir 1.9 from matrix run because it's not supported by the new mime version

[iaguirre88]

Could we also update the other devs dependencies too? 🙏 Like bypass, dialyxir and ex_docs?

Also, are the tests failing for older versions of Elixir? I would prefer not to drop support on legacy versions of Elixir unless is really necessary

[iaguirre88]

• It seems only 1.9 version is failing on the CI so we could remove only that from the matrix
• Also, I agree with removing the e2e during the check step but we still want to run this test in the latest version

[iaguirre88]

🚀🚀🚀