Fix Windows model extraction: rename 7z output to model.bin

7z extracts gzip using the original filename from the gzip header
(jp-0.4.7-5.mod), not the archive name. Rename after extraction.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: chezou

.github/workflows/wheels.yml

@@ -63,11 +63,8 @@ jobs:
           cp  kytea\lib\libkytea.lib lib\kytea\ &&
           swig -Wall -c++ -python -shadow -Iinclude lib\kytea\mykytea.i &&
           Invoke-WebRequest -OutFile model.bin.gz https://github.com/neubig/kytea/raw/master/data/model.bin.gz &&
-          $input = New-Object System.IO.FileStream("model.bin.gz", [IO.FileMode]::Open) &&
-          $gzip = New-Object System.IO.Compression.GZipStream($input, [IO.Compression.CompressionMode]::Decompress) &&
-          $output = New-Object System.IO.FileStream("model.bin", [IO.FileMode]::Create) &&
-          $gzip.CopyTo($output) &&
-          $output.Close(); $gzip.Close(); $input.Close()
+          7z x model.bin.gz &&
+          ren jp-0.4.7-5.mod model.bin
 
       - name: Build wheels
         if: runner.os != 'macOS'