[skip ci] Update version

Author: ai-dial-actions

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "poetry.core.masonry.api"
 
 [project]
 name = "aidial-adapter-openai"
-version = "0.28.0rc"
+version = "0.28.0"
 description = "DIAL adapter for OpenAI"
 authors = [{ name = "EPAM RAIL", email = "SpecialEPM-DIALDevTeam@epam.com" }]
 license = "Apache-2.0"