soroban-tools: Update Cargo.toml to meet core's fees changes

[tsachiherman]

What ?

The XDR was modified to support fees changes. This issue is about the update of the rust components in the soroban-tools repository to compile with these changes.
Two "big" changes that this XDR includes are:

• InvokeHostFunction now includes a list of functions rather then a single function
• The Footprint doesn't go on the operations anymore. Instead, it's a Transaction level field.

Epic

#519