[CI] Updates tested Ruby versions

Author: picandocodigo

.buildkite/pipeline.yml

@@ -15,7 +15,6 @@ steps:
           - "3.2"
           - "3.1"
           - "3.0"
-          - "2.7"
       # Only run platinum once for the latest Ruby. You can use lots of combinations, check the
       # documentation on https://buildkite.com/docs/pipelines/build-matrix for more information.
       adjustments:

.ci/test-matrix.yml

@@ -6,7 +6,6 @@ RUBY_TEST_VERSION:
 - 3.2
 - 3.1
 - 3.0
-- 2.7
 
 TEST_SUITE:
 - free

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '2.7', '3.0', '3.1', '3.2', 'jruby-9.3', 'jruby-9.4' ]
+        ruby: [ '3.0', '3.1', '3.2', 'jruby-9.3', 'jruby-9.4' ]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2