Add v4.x/ps7.4 to the list of release branches (#914)

azure-pipelines.yml

@@ -25,7 +25,7 @@ variables:
 
 steps:
 - pwsh: |
-    $releaseBranches = @('v4.x/ps7.2', 'v4.x/ps7.0', 'v3.x/ps7', 'v3.x/ps6', 'v2.x')
+    $releaseBranches = @('v4.x/ps7.4', 'v4.x/ps7.2', 'v4.x/ps7.0', 'v3.x/ps7', 'v3.x/ps6', 'v2.x')
 
     Write-Host "BuildSourceBranch: $($env:BuildSourceBranch)"
     $branchName = $env:BuildSourceBranch.Replace("refs/heads/", "")