devel/rubygem-opentelemetry-instrumentation-action_mailer: update to 0.5.0
Changes: https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/action_mailer/CHANGELOG.md
(cherry picked from commit 9bffc2d38a45600a36c2b381b574b7d0f2f91ea7)