Bump pyside2 from 5.14.1 to 5.15.2

Bumps [pyside2](https://www.pyside.org) from 5.14.1 to 5.15.2.

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-PySide2==5.14.1
+PySide2==5.15.2
 gpiozero==1.5.1
 pigpio==1.78
 pyserial==3.5