advance utest so it works with -Xsource:3

Author: SethTisue

proj/utest.conf

@@ -2,7 +2,7 @@
 
 vars.proj.utest: ${vars.base} {
   name: "utest"
-  uri: "https://github.com/scalacommunitybuild/utest.git#0ce47b0fef11ac0f0daa8306cfab45c28a3d7171"
+  uri: "https://github.com/scalacommunitybuild/utest.git#7e197d76d7e572d00a0cdbeee676d906b42d3465"
 
   extra.commands: ${vars.default-commands} [
     // latest portable-scala-reflect makes scala-reflect dependency "provided".