Add extra Digest.update overloads for Bytes (#15736)

Ensures that `#to_slice` does indeed return a `Slice(UInt8)`

Author: straight-shoota

src/digest/adler32.cr

@@ -22,8 +22,11 @@ class Digest::Adler32 < ::Digest
   end
 
   def self.update(data, adler32 : UInt32) : UInt32
-    slice = data.to_slice
-    LibZ.adler32(adler32, slice, slice.size).to_u32
+    update data.to_slice, adler32
+  end
+
+  def self.update(data : Bytes, adler32 : UInt32) : UInt32
+    LibZ.adler32(adler32, data, data.size).to_u32
   end
 
   def self.combine(adler1 : UInt32, adler2 : UInt32, len) : UInt32

src/digest/crc32.cr

@@ -22,8 +22,11 @@ class Digest::CRC32 < ::Digest
   end
 
   def self.update(data, crc32 : UInt32) : UInt32
-    slice = data.to_slice
-    LibZ.crc32(crc32, slice, slice.size).to_u32
+    update data.to_slice, crc32
+  end
+
+  def self.update(data : Bytes, crc32 : UInt32) : UInt32
+    LibZ.crc32(crc32, data, data.size).to_u32
   end
 
   def self.combine(crc1 : UInt32, crc2 : UInt32, len) : UInt32