Update default.xml

Bump swift-argument-parser to 1.5.1

Author: compnerd

default.xml

@@ -10,7 +10,7 @@
   <project remote="github" name="swiftlang/indexstore-db" path="indexstore-db" />
   <project remote="github" name="swiftlang/sourcekit-lsp" path="sourcekit-lsp" />
   <project remote="github" name="swiftlang/swift" path="swift" />
-  <project remote="github" name="apple/swift-argument-parser" path="swift-argument-parser" revision="refs/tags/1.4.0" />
+  <project remote="github" name="apple/swift-argument-parser" path="swift-argument-parser" revision="refs/tags/1.5.1" />
   <project remote="github" name="apple/swift-asn1" path="swift-asn1" revision="refs/tags/1.0.0" />
   <project remote="github" name="apple/swift-atomics" path="swift-atomics" revision="refs/tags/1.2.0" />
   <project remote="github" name="swiftlang/swift-build" path="swift-build" revision="main" />