deb packaging: reenable PIE in hardening options

Downstream did this years ago:
https://salsa.debian.org/dns-team/knot-resolver/-/commit/1f3428a62aa59f269e95abf51836db2112ef4d29
otherwise we have issues with building python parts.

distro/pkg/deb/rules

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 # see FEATURE AREAS in dpkg-buildflags(1)
-export DEB_BUILD_MAINT_OPTIONS = hardening=+all,-pie
+export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 
 # see ENVIRONMENT in dpkg-buildflags(1)
 # package maintainers to append CFLAGS