ci: build qis-compiler Windows wheels on windows-2025 (#1974)

The `qis-compiler wheels (windows-2022)` job fails when linking
`selene_hugr_qis_compiler.dll`, with `LNK1120: 11 unresolved externals`
referenced from `libllvm_sys-*.rlib`:

```
libllvm_sys-*.rlib(SymbolSet.cpp.obj) : error LNK2001: unresolved external symbol __std_rotate
libllvm_sys-*.rlib(DXILResource.cpp.obj) : error LNK2019: unresolved external symbol __std_min_element_4u
libllvm_sys-*.rlib(StringRef.cpp.obj) : error LNK2019: unresolved external symbol __std_find_not_ch_1
...
```

These `__std_*` symbols are the vectorized STL algorithm helpers
provided by the MSVC runtime import libraries. The prebuilt LLVM shipped
by hugrenv was compiled against a newer MSVC toolset than the 14.44
toolset available on the `windows-2022` image, so the symbols it
references do not exist in that image's runtime libs.

### Changes

- `.github/workflows/python-qis-wheels.yml`: switch the Windows entry of
the wheel build matrix from `windows-2022` to `windows-2025`, which
ships a newer MSVC toolset. This aligns with the runner already used for
the Windows target in `python-wheels.yml`.
- Added a short comment recording why the newer image is required, so a
future downgrade isn't made accidentally.

Note that the uploaded artifact name is derived from `matrix.os`, so it
changes to `qis-compiler-wheels-windows-2025`; the release job merges
all artifacts by path and is unaffected.

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: aborgna-q <121866228+aborgna-q@users.noreply.github.com>

Author: Copilot

.github/workflows/python-qis-wheels.yml

@@ -47,7 +47,10 @@ jobs:
           - ubuntu-24.04-arm
           - macos-15
           - macos-15-intel
-          - windows-2022
+          # `windows-2025` ships a newer MSVC toolset, required to link against
+          # the prebuilt LLVM libraries (which need the vectorized STL symbols
+          # `__std_rotate`, `__std_min_element_*`, `__std_unique_*`, ...).
+          - windows-2025
     name: "qis-compiler wheels (${{matrix.os}})"
     runs-on: ${{ matrix.os }}
     steps: