Update sbt to 1.5.1 (#379)

scala-steward · web-flow · commit f7b783a0dd0f · 2021-04-28T10:17:01.000+02:00
[skip ci]
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.0
+sbt.version=1.5.1
