Update default.xml

Remove Yams from the repository checkout as it is no longer used.

Author: compnerd

default.xml

@@ -58,8 +58,6 @@
   <project remote="github" name="google/swift-benchmark" path="swift-benchmark" groups="notdefault,tensorflow" />
   <project remote="github" name="google/swift-jupyter" path="swift-jupyter" groups="notdefault,tensorflow" />
 
-  <project remote="github" name="jpsim/Yams" path="Yams" revision="refs/tags/5.0.6" />
-
   <project remote="github" name="Kitware/CMake" path="CMake" groups="notdefault,dependencies" revision="master" />
 
   <project remote="github" name="madler/zlib" path="zlib" revision="refs/tags/v1.3.1" />