temporarily disable Span and MutableSpan for Windows

The current Windows nightly is too old to be able to compile the expected syntax.

Author: glessard

Sources/FoundationEssentials/Data/Data.swift

@@ -2203,6 +2203,7 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
         return try _representation.withUnsafeBytes(body)
     }
 
+#if !os(Windows)
     @available(FoundationSpan 6.2, *)
     public var bytes: RawSpan {
         @lifetime(borrow self)
@@ -2298,6 +2299,7 @@ public struct Data : Equatable, Hashable, RandomAccessCollection, MutableCollect
 #endif
         }
     }
+#endif // !os(Windows)
 
     @_alwaysEmitIntoClient
     public func withContiguousStorageIfAvailable<ResultType>(_ body: (_ buffer: UnsafeBufferPointer<UInt8>) throws -> ResultType) rethrows -> ResultType? {

Tests/FoundationEssentialsTests/DataTests.swift

@@ -1634,6 +1634,7 @@ class DataTests : XCTestCase {
         // source.advanced(by: 5)
     }
 
+#if !os(Windows)
     func test_InlineDataSpan() throws {
         guard #available(FoundationSpan 6.2, *) else { throw XCTSkip("Span not available") }
 
@@ -1777,6 +1778,7 @@ class DataTests : XCTestCase {
         XCTAssertEqual(source[i], 0)
         XCTAssertEqual(source[i+1], .max)
     }
+#endif // !os(Windows)
 
     #if false // FIXME: XCTest doesn't support crash tests yet rdar://20195010&22387653
     func test_bounding_failure_subdata() {