Fix some issues reported by lintian
- Use secure URI in debian/watch.
- Bump debhelper from old 11 to 12. (package-uses-old-debhelper-compat-version)
- Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/gmic/4767694b-5e93-4219-a178-c7250229ad59.