Allow downgrading CMake to build hermesc on Windows (#47867)

Summary:
CI is failing to build HermesC on windows due to a version mismatch of the CMake already installed

## Changelog:
[Internal] - Fix Windows CI for HermesC

Pull Request resolved: #47867

Test Plan: GHA

Reviewed By: robhogan

Differential Revision: D66292617

Pulled By: cipolleschi

fbshipit-source-id: 5e8f4f45e33fbdd9ff163b4e8a09cb98d4366dc7

.github/actions/build-hermesc-windows/action.yml

@@ -43,7 +43,7 @@ runs:
       shell: powershell
       run: |
         if (-not(Test-Path -Path $Env:HERMES_WS_DIR\win64-bin\hermesc.exe)) {
-          choco install --no-progress cmake --version 3.14.7
+          choco install --no-progress cmake --version 3.14.7 --allow-downgrade
           if (-not $?) { throw "Failed to install CMake" }
 
           cd $Env:HERMES_WS_DIR\icu