Update repositories.txt (#6988)

ennio64 · web-flow · commit dc405b70e203 · 2025-09-24T15:47:37.000Z
Subject: [Library Manager] StepperHAL_STM32F4x1 https://github.com/ennio64/StepperHAL_STM32F4x1-Library
diff --git a/repositories.txt b/repositories.txt
@@ -8435,3 +8435,4 @@ https://github.com/valeriofantozzi/TraccarClient.git
 https://github.com/SofaPirate/PqLEDStrip
 https://github.com/dac1e/RcSwitchTransmitter
 https://github.com/nonpawite/bcc-esp-dev
+https://github.com/ennio64/StepperHAL_STM32F4x1-Library
