Update sbt to 1.5.4 (#355)

scala-steward · web-flow · commit 614502d21c48 · 2021-06-14T09:14:09.000+02:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.3
+sbt.version=1.5.4
