Adopted Span and MutableSpan for buffers across the library to adapt to Swift 6.4.

Sources/PlaydateKit/Graphics/Classes/Font.swift

@@ -23,9 +23,11 @@ extension Graphics {
 
         /// Creates a font from the contents of a .pft file already in memory.
         /// The bytes are copied and retained for the font's lifetime.
-        public convenience init?(data: UnsafeRawBufferPointer, wide: Bool = false) {
+        public convenience init?(data: Span<UInt8>, wide: Bool = false) {
             let copy = UnsafeMutableRawPointer.allocate(byteCount: data.count, alignment: 4)
-            copy.copyMemory(from: data.baseAddress.unsafelyUnwrapped, byteCount: data.count)
+            data.withUnsafeBytes { bytes in
+                copy.copyMemory(from: bytes.baseAddress.unsafelyUnwrapped, byteCount: bytes.count)
+            }
             let fontData = OpaquePointer(copy)
             guard let pointer = gfx.pointee.makeFontFromData.unsafelyUnwrapped(
                 fontData, wide ? 1 : 0, Int32(data.count)) else {