Pull Request validation tests

Update CHANGELOG.md to reflect the promotion of 3.12.6

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lint-ruby-3.0.6RAKE_TASK=lint /workdir/.expeditor/buildkite/verify.sh
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run-tests-ruby-3.0.6/workdir/.expeditor/buildkite/verify.sh
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run-tests-ruby-3.1/workdir/.expeditor/buildkite/verify.sh
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run-tests-ruby-3.0-windows/workdir/.expeditor/buildkite/verify.ps1
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run-tests-ruby-3.1-windows/workdir/.expeditor/buildkite/verify.ps1
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Total Job Run Time: 42m 38s