Update sbt to 1.9.9

scala-steward-gatling[bot] · slandelle · commit 7cf4faa9407d · 2024-02-26T08:59:47.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.9.8
+sbt.version=1.9.9
