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Once in a while, official Debian package upload lag behind. Here's how to build your own. (Untested, please let me know if it works)
Run these with root privileges.
# apt-get build-dep gnucap # apt install dpkg-dev fakeroot
These better run without root privileges.
$ git clone https://salsa.debian.org/electronics-team/Gnucap/gnucap $ cd gnucap $ dpkg-buildpackage -rfakeroot $ ls ../*gnucap*deb
And install (as root)
# dpkg -i ../*gnucap*.deb