ci : use dynamic libopenblas.dll for window-blas

[danbev]

This commit updates the windows-blas job to use the dynamic (can load different kernels depending of the CPU arch) libopenblas.dll instead of the "static" openblas.dll that get installed by vcpgk.

The motivation for this change is that there have been reports of performance drops in later version specifically related to blas. Please see the links below for more details.

Resolves: #3166
Refs: #2666 (comment)

[danbev]

To tests this, download whisper-blas-bin-x64.zip.zip and then extract it:

> mkdir temp
> tar xvf .\whisper-blas-bin-x64.zip.zip
> tar xvf .\whisper-blas-bin-x64.zip
> cd .\Release\
> ls


    Directory: C:\win-temp-dir\Release


Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
-a----         5/21/2025   6:36 AM          27136 bench.exe
-a----         5/21/2025   6:36 AM          27136 command.exe
-a----         5/21/2025   6:36 AM         494080 ggml-base.dll
-a----         5/21/2025   6:36 AM          54272 ggml-blas.dll
-a----         5/21/2025   6:37 AM         456192 ggml-cpu.dll
-a----         5/21/2025   6:37 AM          69120 ggml.dll
-a----         1/12/2025   4:34 PM       51126150 libopenblas.dll
-a----         5/21/2025   6:37 AM         184320 lsp.exe
-a----         5/21/2025   6:37 AM          27136 main.exe
-a----         5/21/2025   6:37 AM         108032 quantize.exe
-a----         11/2/2023   5:05 PM        2500096 SDL2.dll
-a----         5/21/2025   6:37 AM          27136 stream.exe
-a----         5/21/2025   6:37 AM         363008 test-vad-full.exe
-a----         5/21/2025   6:37 AM         363008 test-vad.exe
-a----         5/21/2025   6:37 AM         370688 vad-speech-segments.exe
-a----         5/21/2025   6:37 AM         165888 wchess.exe
-a----         5/21/2025   6:37 AM          20480 whisper-bench.exe
-a----         5/21/2025   6:37 AM         480768 whisper-cli.exe
-a----         5/21/2025   6:37 AM         167936 whisper-command.exe
-a----         5/21/2025   6:37 AM         713216 whisper-server.exe
-a----         5/21/2025   6:38 AM         388096 whisper-stream.exe
-a----         5/21/2025   6:39 AM        1529344 whisper-talk-llama.exe
-a----         5/21/2025   6:37 AM         492032 whisper.dll

Notice that we are now including libopenblas.dll instead of openblas.dll.

Note: I'll take a look at why this becomes .zip.zip.

[danbev]

I'll go over the other upload steps in the next few days and make sure they are consistent and don't have the double .zip file extension as well.