Update default.xml

Add swift-tools-protocols to the checkout set

Author: compnerd

default.xml

@@ -47,6 +47,7 @@
   <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/1.0.7" />
+  <project remote="github" name="swiftlang/swift-tools-protocols" path="swift-tools-protocols" revision="refs/tags/0.0.2" />
   <project remote="github" name="swiftlang/swift-tools-support-core" path="swift-tools-support-core" />
   <project remote="github" name="apple/swift-xcode-playground-support" path="swift-xcode-playground-support" groups="notdefault" />