Update sbt to 1.6.1

scala-steward · xuwei-k · commit c31d4a0142fb · 2021-12-30T19:02:35.000+09:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.8
+sbt.version=1.6.1
