devel/rubygem-opentelemetry-instrumentation-active_job: update to 0.7.8
Changes: https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/active_job/CHANGELOG.md
(cherry picked from commit 1f77c4611b4d6be3e0ae1251ce254697ef5ff4cb)