Use a newer version of sbt

cb372 · cb372 · commit 726d34c435f6 · 2023-05-18T13:48:47.000+01:00
Not entirely sure what the impact of this will be. The plugin might stop
working with sbt 1.3.x or older?
diff --git a/project/build.properties b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.3.13
+sbt.version=1.8.3
