Update repositories.txt (#7157)

chipnorm · web-flow · commit 3cbfe7d2582b · 2025-10-27T21:25:03.000Z
diff --git a/repositories.txt b/repositories.txt
@@ -8533,3 +8533,4 @@ https://github.com/stm32duino/X-NUCLEO-IKS5A1
 https://github.com/fermeridamagni/arduino-minimal-ultrasonic
 https://github.com/chipnorm/TM1637
 https://github.com/DavinderHanda/HandaDigitalSpeaker
+https://github.com/chipnorm/SHT21
