Update sbt to 1.9.1 in template (#24)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

project/build.properties

@@ -1 +1 @@
-sbt.version=1.8.3
+sbt.version=1.9.1