Merge pull request swiftlang#28779 from apple/aciidb0mb3r-patch-2

[SwiftPM] Replace new-bootstrap with bootstrap

Author: aciidgh

utils/swift_build_support/swift_build_support/products/swiftpm.py

@@ -30,7 +30,7 @@ def should_build(self, host_target):
 
     def run_bootstrap_script(self, action, host_target, additional_params=[]):
         script_path = os.path.join(
-            self.source_dir, 'Utilities', 'new-bootstrap')
+            self.source_dir, 'Utilities', 'bootstrap')
         toolchain_path = self.install_toolchain_path()
         swiftc = os.path.join(toolchain_path, "usr", "bin", "swiftc")