Update sbt to 1.5.6

scala-steward · scala-steward · commit fba36b6b3560 · 2021-12-10T21:37:14.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.5
+sbt.version=1.5.6
