Bump sbt version to 1.4.6 (#894)

* latest sbt version bump
* Nix dependencies update

Author: Dmitry Voronov

nix/pkgs/mantis.nix

@@ -50,7 +50,7 @@ in sbt.mkDerivation {
 
   # This sha represents the change dependencies of mantis.
   # Update this sha whenever you change the dependencies
-  depsSha256 = "1zsf8yykr8a7p9za4lyw8l1rhqa7ppas049lawp9pn90sj0xkjh5";
+  depsSha256 = "1phwliyya7wnxa53qjh9y5ksskwxihyb8apykq2c33wq9dx72a03";
 
   # this is the command used to to create the fixed-output-derivation
   depsWarmupCommand = "sbt compile --debug -Dnix=true";

project/build.properties

@@ -1 +1 @@
-sbt.version = 1.4.0
+sbt.version = 1.4.6