ci: fix symbol download for SDL pipeline (#179030)

Author: deepak1556

build/azure-pipelines/sdl-scan.yml

@@ -113,6 +113,8 @@ stages:
             condition: eq(variables['Codeql.enabled'], 'True')
 
           - powershell: yarn gulp "vscode-symbols-win32-$(VSCODE_ARCH)"
+            env:
+              GITHUB_TOKEN: "$(github-distro-mixin-password)"
             displayName: Download Symbols
 
           - task: BinSkim@4
@@ -244,6 +246,8 @@ stages:
               VSCODE_QUALITY: stable
 
           - script: yarn gulp vscode-symbols-linux-$(VSCODE_ARCH)
+            env:
+              GITHUB_TOKEN: "$(github-distro-mixin-password)"
             displayName: Build
 
           - task: BinSkim@3