nit: Use anonymous lifetimes for CpiContext

This line https://github.com/Synthetify/synthetify-protocol/blob/master/programs/exchange/src/lib.rs#L1865 can be rewritten

```
impl<'_, '_, '_, 'info> From<&UseSwapLine<'info>> for CpiContext<'_, '_, '_, 'info, MintTo<'info>> {
    fn from(accounts: &UseSwapLine<'info>) -> CpiContext<'_, '_, '_, 'info, MintTo<'info>> {
```