Revert the compiler version check for the span default trait (#209)

* Revert the compiler version check for the span default trait

Author: cmcgee1024

Package.swift

@@ -21,8 +21,8 @@ dep.append(
 // Enable SubprocessFoundation by default
 var defaultTraits: Set<String> = ["SubprocessFoundation"]
 
-#if compiler(>=6.3) || (compiler(>=6.2) && (os(Linux) || os(Windows) || os(FreeBSD)))
-// Enable SubprocessSpan when Span is available
+#if compiler(>=6.2)
+// Enable SubprocessSpan when Span is available.
 defaultTraits.insert("SubprocessSpan")
 #endif