update slixmpp to v1.8.5

Signed-off-by: hwipl <33433250+hwipl@users.noreply.github.com>

setup.py

@@ -61,5 +61,5 @@ def find_version(*file_paths):
     },
     classifiers=CLASSIFIERS,
     python_requires='>=3.7',
-    install_requires=["nuqql-based~=0.3.0", "slixmpp~=1.8.4"],
+    install_requires=["nuqql-based~=0.3.0", "slixmpp~=1.8.5"],
 )