Bump version to v0.18.dev6

Author: prmukherj

src/ansys/fluent/core/_version.py

@@ -6,7 +6,7 @@
 """
 
 # major, minor, patch
-version_info = 0, 18, "dev5"
+version_info = 0, 18, "dev6"
 
 # Nice string for the version
 __version__ = ".".join(map(str, version_info))