[codex] package Windows ARM64 on x64 (#28001)

The first release after parallelizing Windows packaging moved the
critical path to the ARM64 packaging job:

https://github.com/openai/codex/actions/runs/27451157324

The x64 job started immediately and finished in 5m29s. The ARM64
job waited 76s for its runner and then took 5m56s, holding the
release for 1m43s after x64 had finished.

Packaging only downloads, signs, archives, and compresses already
built binaries. It does not execute target code. Run both packaging
jobs on x64 runners, keeping ARM64 hardware for compilation.

.github/workflows/rust-release-windows.yml

@@ -210,11 +210,11 @@ jobs:
             runs_on:
               group: ${{ github.event.repository.name }}-runners
               labels: ${{ github.event.repository.name }}-windows-x64
-          - runner: windows-arm64
+          - runner: windows-x64
             target: aarch64-pc-windows-msvc
             runs_on:
               group: ${{ github.event.repository.name }}-runners
-              labels: ${{ github.event.repository.name }}-windows-arm64
+              labels: ${{ github.event.repository.name }}-windows-x64
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2