packaging: fix Docker build error

The libpcre3-dev package doesn't exist on Debian testing, which caused
an error when trying to build Dockerfile_debian_testing. Adding the
newer libpcre2-dev package as an alternative in the debian/control file
fixes the issue.

GitLab: #1856
Change-Id: I3f9068a67101597eb2ffe7cb5a358870e7284e5b

extras/packaging/gnu-linux/rules/debian/control

@@ -22,7 +22,7 @@ Build-Depends: debhelper (>= 9),
                libpulse-dev,
                libasound2-dev,
                libexpat1-dev,
-               libpcre3-dev,
+               libpcre3-dev | libpcre2-dev,
                libyaml-cpp-dev,
                libboost-dev,
                libxext-dev,