fix(sui): fix PTB upgrade command (#20936)

# Description of change

Fix the PTB upgrade command by converting the package_digest to a vector
instead of an array, because the .pure() function otherwise doesn't add
the required length prefix byte.

Porting over iotaledger/iota#4960

## Type of change

- Bug fix (a non-breaking change which fixes an issue)

## How the change has been tested

Upgrading a package with a PTB command:
`sui client ptb --assign upgrade_cap
@0x6ed2d8b8587fd559e19e1c9d17a9ce8349abe32ff423df73ddfa2056759e90fc
--upgrade . upgrade_cap`

https://testnet.suivision.xyz/txblock/44egvNom79HtLwQinXcpenLbYfex3QSDriGzBpfk58Yx

crates/sui/src/client_ptb/builder.rs

@@ -1043,7 +1043,8 @@ impl<'a> PTBBuilder<'a> {
                     .map_err(|e| err!(cmd_span, "{e}"))?;
                 let digest_arg = self
                     .ptb
-                    .pure(package_digest)
+                    // .to_vec() is necessary to get the length prefix
+                    .pure(package_digest.to_vec())
                     .map_err(|e| err!(cmd_span, "{e}"))?;
                 let upgrade_ticket = self.ptb.command(Tx::Command::move_call(
                     SUI_FRAMEWORK_PACKAGE_ID,