Update sbt to 1.5.5 (#360)

scala-steward · web-flow · commit 9e1ea5c47f1a · 2021-07-12T14:10:00.000+02:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.4
+sbt.version=1.5.5
