Release v0.5.0

What's Changed

• fix syntax error by @utnapischtim in #28
• global: migrate from elasticsearch to opensearch by @utnapischtim in #29
• fix: invenio_search.engine hides used search tool by @utnapischtim in #30
• release v0.5.0 by @utnapischtim in #31

Full Changelog: v0.4.4...v0.5.0