Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 11 to 13. (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/greed/33946cb3-a4a3-460e-aa76-3af7606e4b29.

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/2f/305fb58e147336117210bf857aabb106575d2c.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/a7/94c856026a7e0ab266fb498d0594d67f105ebf.debug

No differences were encountered between the control files of package **greed**

Control files of package greed-dbgsym: lines which differ (wdiff format)

• Build-Ids: a794c856026a7e0ab266fb498d0594d67f105ebf 2f305fb58e147336117210bf857aabb106575d2c

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