Fixed anchor build not working.

[dandamiangow3t]

Fixed anchor build who was failing with various errors due to spl-token-2022 dependency, as two conflicting versions were required by the resolver, respectively v0.5.0 and v0.6.1;

Here is the first two errors showing up, leaving it here as a reference:

error[E0412]: cannot find type `CloseAccountData` in this scope
   --> src/extension/confidential_transfer/instruction.rs:688:18
    |
688 |     proof_data: &CloseAccountData,
    |                  ^^^^^^^^^^^^^^^^ not found in this scope

error[E0412]: cannot find type `WithdrawWithheldTokensData` in this scope
    --> src/extension/confidential_transfer/instruction.rs:1086:18
     |
497  | pub struct WithdrawWithheldTokensFromMintData {
     | --------------------------------------------- similarly named struct `WithdrawWithheldTokensFromMintData` defined here

After various tryings it really came down to upgrading both anchor-lang and anchor-spl to v0.28.0.