db: fix upstream version check

db: fix upstream version check

The new regex excludes the 5.3.28+dfsg1 which is a Debian
repackaging of the original tarball:

* Repack the .orig tarball to eliminate prebuilt binaries that need a
    Visual Studio plugin to build from source. (Closes: #898215)

https://metadata.ftp-master.debian.org/changelogs/main/d/db5.3/unstable_changelog

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>