dep: bump sbt to 1.6.1 (#431)

ckipp01 · web-flow · commit ddb584da71b3 · 2022-01-11T10:09:59.000+01:00
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.5
+sbt.version=1.6.1
