Update flaml requirement from <2.2.0 to <2.4.0 in /mlos_core

Updates the requirements on [flaml](https://github.com/microsoft/FLAML) to permit the latest version.
- [Release notes](https://github.com/microsoft/FLAML/releases)
- [Commits](microsoft/FLAML@v0.1.0...v2.3.0)

---
updated-dependencies:
- dependency-name: flaml
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

mlos_core/setup.py

@@ -69,7 +69,7 @@ def _get_long_desc_from_readme(base_url: str) -> dict:
 
 extra_requires: Dict[str, List[str]] = {  # pylint: disable=consider-using-namedtuple-or-dataclass
     "flaml": [
-        "flaml<2.2.0",  # FIXME: temporarily avoid changes in new FLAML package (#839).
+        "flaml<2.4.0",  # FIXME: temporarily avoid changes in new FLAML package (#839).
         "flaml[blendsearch]",
     ],
     # NOTE: Major refactoring on SMAC and ConfigSpace v1.0 starting from v2.2