Bump opentracing-api-extensions-tracer from 0.3.0 to 0.4.0
Bump opentracing-api-extensions-tracer from 0.3.0 to 0.4.0

Bumps [opentracing-api-extensions-tracer](https://github.com/opentracing-contrib/java-api-extensions) from 0.3.0 to 0.4.0.
- [Release notes](https://github.com/opentracing-contrib/java-api-extensions/releases)
- [Changelog](https://github.com/opentracing-contrib/java-api-extensions/blob/master/RELEASE.md)
- [Commits](https://github.com/opentracing-contrib/java-api-extensions/compare/0.3.0...0.4.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
whiskeysierra/tracer,whiskeysierra/tracer,zalando/tracer,zalando/tracer