Update dependency sbt/sbt to v1.12.9 (#772)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

junit-jupiter-starter-sbt/project/build.properties

@@ -1 +1 @@
-sbt.version=1.12.8
+sbt.version=1.12.9