Fix issue with packages containing dots in bump-packages script

[victorpopkov]

Problem

Similar to dstmodders/docker-imagemagick#37:

In bump-packages.sh script, packages like libperl5.40 inside Debian images are not correctly recognized. Originally, we didn't have cases where dots are used inside package names, so we need to adapt our scripts to handle this edge case.

Proposed solution

Fix issue inside get_packages_from_dockerfile() to support packages like libperl5.40.

Progress

• Fix issue with packages containing dots in bump-packages script.