Update default.xml

Branch swift-build from the proper branch for `release/6.2`.

Author: compnerd

default.xml

@@ -13,7 +13,7 @@
  <project remote="github" name="apple/swift-argument-parser" path="swift-argument-parser" revision="refs/tags/1.4.0" />
  <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" />
+ <project remote="github" name="swiftlang/swift-build" path="swift-build" />
  <project remote="github" name="apple/swift-certificates" path="swift-certificates" revision="refs/tags/1.0.1" />
  <project remote="github" name="swiftlang/swift-cmark" path="cmark" revision="gfm" />
  <project remote="github" name="apple/swift-collections" path="swift-collections" revision="refs/tags/1.1.3" />