Update sbt to 1.5.6

scala-steward · scala-steward · commit 8971eeb7414a · 2021-12-10T13:07:56.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.5
+sbt.version=1.5.6
