chore: increment version to 4.8.0rc5 (#17688)

Co-authored-by: zach.groves <zach.groves@datadoghq.com>

Author: ZStriker19

pyproject.toml

@@ -9,7 +9,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "ddtrace"
-version = "4.8.0rc4"
+version = "4.8.0rc5"
 description = "Datadog APM client library"
 readme = "README.md"
 license = { text = "LICENSE.BSD3" }