ci: remove OTP matrix, CT fails on OTP 27

Author: Taure

.github/workflows/erlang.yml

@@ -7,7 +7,6 @@ jobs:
     uses: Taure/erlang-ci/.github/workflows/ci.yml@v1
     with:
       otp-version: '28.0'
-      otp-matrix: '["26.1", "27.1", "28.0"]'
       enable-eunit: false
       enable-ct: true
       enable-dialyzer: false