revert #21142

Author: chlowell

eng/pipelines/templates/steps/build-test.yml

@@ -64,8 +64,6 @@ steps:
 
   - ${{ if eq(parameters.TestProxy, true) }}:
     - template: /eng/common/testproxy/test-proxy-tool.yml
-      parameters:
-        targetVersion: '1.0.0-dev.20230427.1'
 
   - task: PowerShell@2
     displayName: 'Run Tests'