Debian: Add build-depends on catch2 >3.4.0

[why]
We now require Catch2 v3 from an external package for building the unit
test suite.

Proposed-by: Fini Jastrow <fini.jastrow@desy.de>
Signed-off-by: Lars Froehlich <lars.froehlich@desy.de>

Author: alt-graph

debian/control

@@ -3,7 +3,7 @@ Section: devel
 Priority: optional
 Maintainer: Jannik Woehnert <jannik.woehnert@desy.de>
 Standards-Version: 4.6.0
-Build-Depends: dev-doocs-libgul14 | libgul14-dev, meson (>=0.50.0), pkg-config, debhelper-compat (=12), libgit2-dev
+Build-Depends: dev-doocs-libgul14 | libgul14-dev, meson (>=0.50.0), pkg-config, debhelper-compat (=12), catch2 (>>3.4.0), libgit2-dev
 
 Package: libgit4cpp-0-4-8
 Section: libs