chore: fix warning for deref on a double reference

[wolfv]

When building pixi, I got the warning:

warning: using `.deref()` on a double reference, which returns `&RepoDataRecord` instead of dereferencing the inner type
   --> /Users/wolfv/Programs/rattler/crates/rattler_solve/src/resolvo/mod.rs:449:61
    |
449 |                 SolverPackageRecord::Record(rec) => Some(rec.deref().clone()),
    |                                                             ^^^^^^^^
    |
    = note: `#[warn(suspicious_double_ref_op)]` on by default

warning: `rattler_solve` (lib) generated 1 warning

I think this fixes it.