Set version to 1.1.1

Author: github-actions[bot]

Project.toml

@@ -1,7 +1,7 @@
 name = "MultilayerGraphs"
 uuid = "af984530-d72f-4904-8b81-b992bbbeaf3f"
 authors = ["Claudio Moroni <[email protected]>", "Pietro Monticone <[email protected]>"]
-version = "1.1.0"
+version = "1.1.1"
 
 [deps]
 Bijections = "e2ed5e7c-b2de-5872-ae92-c73ca462fb04"