Install netcat-openbsd as dependency explicitly

Since Debian Stretch and Ubuntu Bionic, the "netcat" package is a transitional dummy package which pulls in "netcat-traditional" on Debian Stretch+Buster and Ubuntu Bionic, and "netcat-openbsd" on Debian Bullseye, Ubuntu Focal and up.

On Debian Bookworm (testing), however, the "netcat" package has been removed during the last 3 days at time or writing, so that it fails do be installed. While "netcat-traditional" and "netcat-openbsd" both "Provides: netcat", since it's two alternatives, APT does not automatically pick one but aborts, and the only solution is to install one explicitly.

While this is likely a temporary state of the Debian testing suite, having a closer look at the two alternatives shows that "netcat-openbsd" is a much more actively maintained newer version with additional support for IPv6, proxies, and UNIX sockets, which is likely the reason for the gradual transition via meta package from "netcat-traditional" to "netcat-openbsd". This commit hence consequently follows this aim by skipping the transitional dummy package and installing "netcat-openbsd" explicitly as dependency, to avoid any possible errors like the one which occurs currently on Bookworm.

Both packages can be installed concurrently and do no conflict, but are managed via dpkg's "update-alternatives".

For reference:
- https://packages.debian.org/netcat
- https://packages.ubuntu.com/netcat

Signed-off-by: MichaIng <micha@dietpi.com>

automated install/basic-install.sh

@@ -287,7 +287,7 @@ package_manager_detect() {
         # Packages required to run this install script (stored as an array)
         INSTALLER_DEPS=(git iproute2 whiptail ca-certificates)
         # Packages required to run Pi-hole (stored as an array)
-        PIHOLE_DEPS=(cron curl iputils-ping psmisc sudo unzip idn2 sqlite3 libcap2-bin dns-root-data libcap2 netcat)
+        PIHOLE_DEPS=(cron curl iputils-ping psmisc sudo unzip idn2 sqlite3 libcap2-bin dns-root-data libcap2 netcat-openbsd)
         # Packages required for the Web admin interface (stored as an array)
         # It's useful to separate this from Pi-hole, since the two repos are also setup separately
         PIHOLE_WEB_DEPS=(lighttpd "${phpVer}-common" "${phpVer}-cgi" "${phpVer}-sqlite3" "${phpVer}-xml" "${phpVer}-intl")