Correct Pyston tag format (#10580)

## Summary

Empirically, it looks like the format here is slightly different than
what we had in the code? Our integration test caught it.

crates/uv-resolver/src/requires_python.rs

@@ -469,9 +469,6 @@ impl RequiresPython {
                 } | AbiTag::GraalPy {
                     python_version: (2, ..),
                     ..
-                } | AbiTag::Pyston {
-                    python_version: (2, ..),
-                    ..
                 }
             ) {
                 // Python 2 is never allowed.
@@ -487,10 +484,6 @@ impl RequiresPython {
             | AbiTag::GraalPy {
                 python_version: (3, minor),
                 ..
-            }
-            | AbiTag::Pyston {
-                python_version: (3, minor),
-                ..
             } = abi_tag
             {
                 // Ex) If the wheel bound is `3.6`, then it doesn't match `>=3.10`.