fix: remove MySQL version pin in legacy CI workflow

The pinned versions 8.4.6 and 8.4.9 both fail — 8.4.6 downloads from a
dead CDN URL, and 8.4.9 doesn't exist on Chocolatey. Removing the pin
lets Chocolatey resolve the latest approved version with a valid URL.

Author: doron050

.github/workflows/legacy-tests.yml

@@ -71,7 +71,7 @@ jobs:
           shell: pwsh
           command: |
             $mysqlJob = Start-Job -ScriptBlock { 
-              choco install mysql --no-progress --version=8.4.9 -y --params "/serviceName:MySQL" 
+              choco install mysql --no-progress -y --params "/serviceName:MySQL" 
               return $LASTEXITCODE
             }