FIX: cast post version to int

setup.py

@@ -47,7 +47,7 @@ if util_version != latest_previous_util_version and str(largest_ver) == latest_p
 
 setup(
     name='netdb_client',
-    version=f'{str(largest_ver)}{".post" + post_version if post_version is not None else ""}{".dev1" if os.environ.get("CI_COMMIT_BRANCH", "local") == "devel" else ""}+{util_version}',
+    version=f'{str(largest_ver)}{".post" + str(post_version) if post_version is not None else ""}{".dev1" if os.environ.get("CI_COMMIT_BRANCH", "local") == "devel" else ""}+{util_version}',
     author='NETVS-Team <netvs@scc.kit.edu>',
     description='This is a meta package to install the automatically generated NET-API definitions for the currently supported API versions.',
     url='https://git.scc.kit.edu/scc-net/net-suite/netdb-client-lib',