Split a Choco-Install command

In https://github.com/ruby/ruby/runs/2552065052, while it failed to
install winflexbison3, it exited the retry loop because openssl was
installed successfully.

a5ee51f72d/images/win/scripts/ImageHelpers/ChocoHelpers.ps1

.github/workflows/windows.yml

@@ -35,7 +35,10 @@ jobs:
             ${{ runner.os }}-chocolatey-
       - name: Install libraries with chocolatey
         run: |
-          Choco-Install -PackageName openssl winflexbison3
+          # Using Choco-Install for retries, but it doesn't detect failures properly
+          # if you pass multiple package names in a single command.
+          Choco-Install -PackageName openssl
+          Choco-Install -PackageName winflexbison3
         shell: pwsh
       - name: git config
         run: |