message: Update version to 5.4.0 in regression tests
diff: @@ -63,11 +63,11 @@ languages:
  outputPath: ../core/test/regression/python
  oldArgs:
  - --v3
  - - --use:@autorest/python@5.1.0-preview.3
  + - --use:@autorest/python@5.4.0
  newArgs:
  - --version:../core
  - --v3
  - - --use:@autorest/python@5.1.0-preview.3
  + - --use:@autorest/python@5.4.0
  - language: typescript
  outputPath: ../core/test/regression/typescript
  oldArgs:
  