Fix CI (#515)

* fix: Faker.File tests

* fix: ci

* run on older ubuntu

* new matrix

* no need to run credo on many versions

* Specify versions

* Test more

* generate plt

* test

* 25

* 1.15

* 26

* test on 2

* try diff alg

* try new alg on ci

* Revert "try new alg on ci"

This reverts commit f4846bb.

* Revert "try diff alg"

This reverts commit 74e4ba9.

* new matrix

* Revert "fix: Faker.File tests"

This reverts commit 4e97288.

* don't test on otp 26