Use the previous winflexbison3

winflexbison3 v2.5.23.20200829 seems to install nothing.

.github/workflows/windows.yml

@@ -32,7 +32,8 @@ jobs:
             ${{ runner.os }}-chocolatey-
       - name: Install libraries with chocolatey
         run: |
-          choco install --no-progress openssl winflexbison3
+          choco install --no-progress openssl
+          choco install --no-progress winflexbison3 --version=2.5.18.20190508
       - name: git config
         run: |
           git config --system advice.detachedHead 0