Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper dependency to >= 10, since that's what is used in debian/compat. (no-versioned-debhelper-prerequisite)

• Bump debhelper from old 10 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/carbon-c-relay/64596529-37b5-496a-88b3-011243157f91.

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 first set of .debs but not in second

-rw-r--r--  root/root   /etc/init/carbon-c-relay.conf

No differences were encountered between the control files of package **carbon-c-relay**

No differences were encountered between the control files of package **carbon-c-relay-dbgsym**

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