Update python dependencies

Change-Id: Ibdd8704d5526c69f8fe4c9199c8bea3f1d92333c
diff --git a/ndns/debian/control b/ndns/debian/control
index 5d9e8a0..c1b6731 100644
--- a/ndns/debian/control
+++ b/ndns/debian/control
@@ -3,7 +3,7 @@
 Priority: optional
 Maintainer: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
 Build-Depends: debhelper (>= 9.20160709),
- python3 (>= 3.6.0),
+ python3 (>= 3.8),
  pkg-config (>= 0.29),
  libboost-all-dev (>= 1.65.1),
  libndn-cxx-dev (>= 0.8.0),