Re-export upstream signing key without extra signatures.

Changes-By: lintian-brush
Fixes: lintian: public-upstream-key-not-minimal
See-also: https://lintian.debian.org/tags/public-upstream-key-not-minimal.html

debian/changelog

@@ -1,3 +1,9 @@
+dulwich (0.20.8-2) UNRELEASED; urgency=medium
+
+  * Re-export upstream signing key without extra signatures.
+
+ -- Debian Janitor <janitor@jelmer.uk>  Sat, 28 Nov 2020 14:21:47 -0000
+
 dulwich (0.20.8-1) unstable; urgency=medium
 
   [ Ondřej Nový ]