Update python-integration-tests.yml (microsoft#2555)

Fix variable expansion in conditional -- hypothesis is that the value is
expanded before the step runs, ruining things.

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- [ ] The PR follows the [SK Contribution
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.github/workflows/python-integration-tests.yml

@@ -39,7 +39,7 @@ jobs:
         run: echo "NOT python file"
 
   python-merge-gate:
-    if: ${{ github.event_name != 'pull_request' && github.event_name != 'schedule' && needs.paths-filter.outputs.pythonChanges == 'true' }}
+    if: github.event_name != 'pull_request' && github.event_name != 'schedule' && needs.paths-filter.outputs.pythonChanges == 'true'
     runs-on: ${{ matrix.os }}
     strategy:
       max-parallel: 1
@@ -94,7 +94,7 @@ jobs:
           poetry run pytest ./tests/integration -v
 
   python-integration-tests:
-    if: ${{ (github.event_name == 'schedule' || github.event_name == 'workflow_dispatch') && needs.paths-filter.outputs.pythonChanges == 'true' }}
+    if: (github.event_name == 'schedule' || github.event_name == 'workflow_dispatch') && needs.paths-filter.outputs.pythonChanges == 'true'
     runs-on: ${{ matrix.os }}
     strategy:
       max-parallel: 1