TT#120300 Increase package version with new sipwise20210511

There is upgrade of debian version to bullseye so bump major version.

Change-Id: I787f970872446d806b4cce2262730701cdfdf9b1

debian/changelog

@@ -1,3 +1,9 @@
+ngcp-pxe-boot (0.7.0.1+0~sipwise20210511) unstable; urgency=medium
+
+  * [0a94f8b] TT#120300 Update binary files to Grml-sipwise20210511
+
+ -- Mykola Malkov <mmalkov@sipwise.com>  Wed, 12 May 2021 11:48:49 +0300
+
 ngcp-pxe-boot (0.6.4.1+0~sipwise20200713) unstable; urgency=medium
 
   [ Guillem Jover ]