[6.1] Update related dependencies to release/6.1 (#8157)

Author: ahoppen

Package.swift

@@ -929,7 +929,7 @@ func swiftSyntaxDependencies(_ names: [String]) -> [Target.Dependency] {
 // this right now.
 
 /// When not using local dependencies, the branch to use for llbuild and TSC repositories.
-let relatedDependenciesBranch = "main"
+let relatedDependenciesBranch = "release/6.1"
 
 if ProcessInfo.processInfo.environment["SWIFTPM_LLBUILD_FWK"] == nil {
     if ProcessInfo.processInfo.environment["SWIFTCI_USE_LOCAL_DEPS"] == nil {