Update default.xml

Update swift-system to 1.5.0

Author: compnerd

default.xml

@@ -42,7 +42,7 @@
   <project remote="github" name="swiftlang/swift-package-manager" path="swift-package-manager" />
   <project remote="github" name="apple/swift-protobuf" path="swift-protobuf" groups="notdefault" />
   <project remote="github" name="swiftlang/swift-syntax" path="swift-syntax" />
-  <project remote="github" name="apple/swift-system" path="swift-system" revision="refs/tags/1.4.1" />
+  <project remote="github" name="apple/swift-system" path="swift-system" revision="refs/tags/1.5.0" />
   <project remote="github" name="swiftlang/swift-testing" path="swift-testing" />
   <project remote="github" name="swiftlang/swift-toolchain-sqlite" path="swift-toolchain-sqlite" revision="refs/tags/1.0.1" />
   <project remote="github" name="swiftlang/swift-tools-support-core" path="swift-tools-support-core" />