Remove hardcoded refs from ociartifact code

Fixes: https://issues.redhat.com/browse/RUN-3578

Signed-off-by: Nicola Sella <nsella@redhat.com>

vendor/github.com/klauspost/compress/internal/snapref/encode.go

@@ -20,8 +20,10 @@ import (
 func Encode(dst, src []byte) []byte {
 	if n := MaxEncodedLen(len(src)); n < 0 {
 		panic(ErrTooLarge)
-	} else if len(dst) < n {
+	} else if cap(dst) < n {
 		dst = make([]byte, n)
+	} else {
+		dst = dst[:n]
 	}
 
 	// The block starts with the varint-encoded length of the decompressed bytes.