devel/rubygem-opentelemetry-instrumentation-grape-gitlab: update to 0.5.1
Required by gitlab 19.1.0
Changes: https://github.com/open-telemetry/opentelemetry-ruby-contrib/blob/main/instrumentation/grape/CHANGELOG.md
(cherry picked from commit 43b1746adc90d3552c6581a68a901ca4ab30f117)