Keep released QPK pin for CI compatibility

Author: Pigbibi

requirements.txt

@@ -1,6 +1,6 @@
 flask
 gunicorn
-quant-platform-kit @ git+https://github.com/QuantStrategyLab/QuantPlatformKit.git@fix-ibkr-longbridge-cash-diagnostics
+quant-platform-kit @ git+https://github.com/QuantStrategyLab/QuantPlatformKit.git@v0.7.18
 us-equity-strategies @ git+https://github.com/QuantStrategyLab/UsEquityStrategies.git@main
 pandas
 numpy