automation: bump version to 1.9.1 (#473)

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Author: github-actions[bot]

gradle/version.properties

@@ -1,3 +1,3 @@
-version=1.9.0
-code=1009000000
-name=v1.9.0
+version=1.9.1
+code=1009001000
+name=v1.9.1