Merge pull request #14463 from leandrolanzieri/pr/kconfiglib/riot_men…

…uconfig_python3

dist/tools/kconfiglib: Use python3 for RIOT adaption of menuconfig

dist/tools/kconfiglib/riot_menuconfig.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """ Menuconfig variant which uses RiotKconfig as base class """
 import menuconfig
 from riot_kconfig import standard_riot_kconfig